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Multilevel and Longitudinal Modeling Using Stata, Third Edition
Volume I: Continuous Responses
Volume II: Categorical Responses, Counts, and Survival
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Volume I: Continuous ResponsesISBN-13: 978-1-59718-103-7 Pages: 497; paperback Price $62.00
See a larger photo of the front cover of Volume I |
Volume II: Categorical Responses, Counts, and SurvivalISBN-13: 978-1-59718-104-4Pages: 477; paperback Price $62.00
See a larger photo of the front cover of Volume II |
Comment from the Stata technical group
Multilevel and Longitudinal Modeling Using Stata, Third Edition, by Sophia Rabe-Hesketh and Anders Skrondal, looks specifically at Stata’s treatment of generalized linear mixed models, also known as multilevel or hierarchical models. These models are “mixed” because they allow fixed and random effects, and they are “generalized” because they are appropriate for continuous Gaussian responses as well as binary, count, and other types of limited dependent variables.
The material in the third edition consists of two volumes, a result of the substantial expansion of material from the second edition, and has much to offer readers of the earlier editions. The text has almost doubled in length from the second edition and almost quadrupled in length from the original version to almost 1,000 pages across the two volumes. Fully updated for Stata 12, the book has 5 new chapters and many new exercises and datasets.
The two volumes comprise 16 chapters organized into eight parts.
Volume I is devoted to continuous Gaussian linear mixed models and has nine chapters organized into four parts. The first part reviews the methods of linear regression. The second part provides in-depth coverage of two-level models, the simplest extensions of a linear regression model.
Rabe-Hesketh and Skrondal begin with the comparatively simple random-intercept linear model without covariates, developing the mixed model from principles and thereby familiarizing the reader with terminology, summarizing and relating the widely used estimating strategies, and providing historical perspective. Once the authors have established the mixed-model foundation, they smoothly generalize to random-intercept models with covariates and then to a discussion of the various estimators (between, within, and random-effects). The authors then discuss models with random coefficients.
The third part of volume I describes models for longitudinal and panel data, including dynamic models, marginal models (a new chapter), and growth-curve models (a new chapter). The fourth and final part covers models with nested and crossed random effects, including a new chapter describing in more detail higher-level nested models for continuous outcomes.
The mixed-model foundation and the in-depth coverage of the mixed-model principles provided in volume I for continuous outcomes make it straightforward to transition to generalized linear mixed models for noncontinuous outcomes, which are described in volume II.
Volume II is devoted to generalized linear mixed models for binary, categorical, count, and survival outcomes. The second volume has seven chapters also organized into four parts. The first three parts in volume II cover models for categorical responses, including binary, ordinal, and nominal (a new chapter); models for count data; and models for survival data, including discrete-time and continuous-time (a new chapter) survival responses. The fourth and final part in volume II describes models with nested and crossed-random effects with an emphasis on binary outcomes.
The book has extensive applications of generalized mixed models performed in Stata. Rabe-Hesketh and Skrondal developed gllamm, a Stata program that can fit many latent-variable models, of which the generalized linear mixed model is a special case. As of version 10, Stata contains the xtmixed, xtmelogit, and xtmepoisson commands for fitting multilevel models, in addition to other xt commands for fitting standard random-intercept models. The types of models fit by these commands sometimes overlap; when this happens, the authors highlight the differences in syntax, data organization, and output for the two (or more) commands that can be used to fit the same model. The authors also point out the relative strengths and weaknesses of each command when used to fit the same model, based on considerations such as computational speed, accuracy, available predictions, and available postestimation statistics.
In summary, this book is the most complete, up-to-date depiction of Stata’s capacity for fitting generalized linear mixed models. The authors provide an ideal introduction for Stata users wishing to learn about this powerful data analysis tool.
Table of contents
List of Tables
List of Figures
Preface
Multilevel and longitudinal models: When and why?
I Preliminaries
1 Review of linear regression
1.1 Introduction
1.2 Is there gender discrimination in faculty salaries?
1.3 Independent-samples t test
1.4 One-way analysis of variance
1.5 Simple linear regression
1.6 Dummy variables
1.7 Multiple linear regression
1.8 Interactions
1.9 Dummy variables for more than two groups
1.10 Other types of interactions
1.12 Residual diagnostics
1.13 Causal and noncausal interpretations of regression coefficients
1.15 Exercises
1.2 Is there gender discrimination in faculty salaries?
1.3 Independent-samples t test
1.4 One-way analysis of variance
1.5 Simple linear regression
1.6 Dummy variables
1.7 Multiple linear regression
1.8 Interactions
1.9 Dummy variables for more than two groups
1.10 Other types of interactions
1.10.1 Interaction between dummy variables
1.10.2 Interaction between continuous covariates
1.11 Nonlinear effects 1.10.2 Interaction between continuous covariates
1.12 Residual diagnostics
1.13 Causal and noncausal interpretations of regression coefficients
1.13.1 Regression as conditional expectation
1.13.2 Regression as structural model
1.14 Summary and further reading 1.13.2 Regression as structural model
1.15 Exercises
II Two-level models
2 Variance-components models
2.1 Introduction
2.2 How reliable are peak-expiratory-flow measurements?
2.3 Inspecting within-subject dependence
2.4 The variance-components model
2.8 Fixed versus random effects
2.9 Crossed versus nested effects
2.10 Parameter estimation
2.13 Exercises
2.2 How reliable are peak-expiratory-flow measurements?
2.3 Inspecting within-subject dependence
2.4 The variance-components model
2.4.1 Model specification
2.4.2 Path diagram
2.4.3 Between-subject heterogeneity
2.4.4 Within-subject dependence
2.5 Estimation using Stata 2.4.2 Path diagram
2.4.3 Between-subject heterogeneity
2.4.4 Within-subject dependence
Intraclass correlation
Intraclass correlation versus Pearson correlation
Intraclass correlation versus Pearson correlation
2.5.1 Data preparation: Reshaping to long form
2.5.2 Using xtreg
2.5.3 Using xtmixed
2.6 Hypothesis tests and confidence intervals 2.5.2 Using xtreg
2.5.3 Using xtmixed
2.6.1 Hypothesis test and confidence interval for the population mean
2.6.2 Hypothesis test and confidence interval for the between-cluster variance
2.7 Model as data-generating mechanism 2.6.2 Hypothesis test and confidence interval for the between-cluster variance
Likelihood-ratio test
F test
Confidence intervals
F test
Confidence intervals
2.8 Fixed versus random effects
2.9 Crossed versus nested effects
2.10 Parameter estimation
2.10.1 Model assumptions
2.10.3 Inference for β
2.11 Assigning values to the random intercepts
Mean structure and covariance structure
Distributional assumptions
2.10.2 Different estimation methods Distributional assumptions
2.10.3 Inference for β
Estimate and standard error: Balanced case
Estimate: Unbalanced case
Estimate: Unbalanced case
2.11.1 Maximum “likelihood” estimation
2.11.3 Empirical Bayes standard errors
2.12 Summary and further reading
Implementation via OLS regression
Implementation via the mean total residual
2.11.2 Empirical Bayes prediction Implementation via the mean total residual
2.11.3 Empirical Bayes standard errors
Comparative standard errors
Diagnostic standard errors
Diagnostic standard errors
2.13 Exercises
3 Random-intercept models with covariates
3.1 Introduction
3.2 Does smoking during pregnancy affect birthweight?
3.6 Hypothesis tests and confidence intervals
3.9 Assigning values to random effects: Residual diagnostics
3.10 More on statistical inference
3.12 Exercises
3.2 Does smoking during pregnancy affect birthweight?
3.2.1 Data structure and descriptive statistics
3.3 The linear random-intercept model with covariates
3.3.1 Model specification
3.3.2 Model assumptions
3.3.3 Mean structure
3.3.4 Residual variance and intraclass correlation
3.3.5 Graphical illustration of random-intercept model
3.4 Estimation using Stata 3.3.2 Model assumptions
3.3.3 Mean structure
3.3.4 Residual variance and intraclass correlation
3.3.5 Graphical illustration of random-intercept model
3.4.1 Using xtreg
3.4.2 Using xtmixed
3.5 Coefficients of determination or variance explained 3.4.2 Using xtmixed
3.6 Hypothesis tests and confidence intervals
3.6.1 Hypothesis tests for regression coefficients
3.6.3 Hypothesis test for random-intercept variance
3.7 Between and within effects of level-1 covariates
Hypothesis tests for individual regression coefficients
Joint hypothesis tests for several regression coefficients
3.6.2 Predicted means and confidence intervals Joint hypothesis tests for several regression coefficients
3.6.3 Hypothesis test for random-intercept variance
3.7.1 Between-mother effects
3.7.2 Within-mother effects
3.7.3 Relations among estimators
3.7.4 Level-2 endogeneity and cluster-level confounding
3.7.5 Allowing for different within and between effects
3.7.6 Hausman endogeneity test
3.8 Fixed versus random effects revisited 3.7.2 Within-mother effects
3.7.3 Relations among estimators
3.7.4 Level-2 endogeneity and cluster-level confounding
3.7.5 Allowing for different within and between effects
3.7.6 Hausman endogeneity test
3.9 Assigning values to random effects: Residual diagnostics
3.10 More on statistical inference
3.10.1 Overview of estimation methods
3.10.2 Consequences of using standard regression modeling for clustered data
3.10.3 Power and sample-size determination
3.11 Summary and further reading 3.10.2 Consequences of using standard regression modeling for clustered data
3.10.3 Power and sample-size determination
3.12 Exercises
4 Random-coefficient models
4.1 Introduction
4.2 How effective are different schools?
4.3 Separate linear regressions for each school
4.4 Specification and interpretation of a random-coefficient model
4.7 Interpretation of estimates
4.8 Assigning values to the random intercepts and slopes
4.10 Some warnings about random-coefficient models
4.12 Exercises
4.2 How effective are different schools?
4.3 Separate linear regressions for each school
4.4 Specification and interpretation of a random-coefficient model
4.4.1 Specification of a random-coefficient model
4.4.2 Interpretation of the random-effects variances and covariances
4.5 Estimation using xtmixed 4.4.2 Interpretation of the random-effects variances and covariances
4.5.1 Random-intercept model
4.5.2 Random-coefficient model
4.6 Testing the slope variance 4.5.2 Random-coefficient model
4.7 Interpretation of estimates
4.8 Assigning values to the random intercepts and slopes
4.8.1 Maximum “likelihood” estimation
4.8.2 Empirical Bayes prediction
4.8.3 Model visualization
4.8.4 Residual diagnostics
4.8.5 Inferences for individual schools
4.9 Two-stage model formulation 4.8.2 Empirical Bayes prediction
4.8.3 Model visualization
4.8.4 Residual diagnostics
4.8.5 Inferences for individual schools
4.10 Some warnings about random-coefficient models
4.10.1 Meaningful specification
4.10.2 Many random coefficients
4.10.3 Convergence problems
4.10.4 Lack of identification
4.11 Summary and further reading 4.10.2 Many random coefficients
4.10.3 Convergence problems
4.10.4 Lack of identification
4.12 Exercises
III Models for longitudinal and panel data
Introduction to models for longitudinal and panel data (part III)
5 Subject-specific effects and dynamic models
5.1 Introduction
5.2 Conventional random-intercept model
5.3 Random-intercept models accommodating endogenous covariates
5.6 Fixed-coefficient model
5.7 Lagged-response or dynamic models
5.10 Exercises
5.2 Conventional random-intercept model
5.3 Random-intercept models accommodating endogenous covariates
5.3.1 Consistent estimation of effects of endogenous time-varying covariates
5.3.2 Consistent estimation of effects of endogenous time-varying and endogenous time-constant covariates
5.4 Fixed-intercept model 5.3.2 Consistent estimation of effects of endogenous time-varying and endogenous time-constant covariates
5.4.1 Using xtreg or regress with a differencing operator
5.4.2 Using anova
5.5 Random-coefficient model 5.4.2 Using anova
5.6 Fixed-coefficient model
5.7 Lagged-response or dynamic models
5.7.1 Conventional lagged-response model
5.7.2 Lagged-response model with subject-specific intercepts
5.8 Missing data and dropout 5.7.2 Lagged-response model with subject-specific intercepts
5.8.1 Maximum likelihood estimation under MAR: A simulation
5.9 Summary and further reading 5.10 Exercises
6 Marginal models
6.1 Introduction
6.2 Mean structure
6.3 Covariance structures
6.6 Generalized estimating equations (GEE)
6.7 Marginal modeling with few units and many occasions
6.9 Exercises
6.2 Mean structure
6.3 Covariance structures
6.3.1 Unstructured covariance matrix
6.3.2 Random-intercept or compound symmetric/exchangeable structure
6.3.3 Random-coefficient structure
6.3.4 Autoregressive and exponential structures
6.3.5 Moving-average residual structure
6.3.6 Banded and Toeplitz structures
6.4 Hybrid and complex marginal models 6.3.2 Random-intercept or compound symmetric/exchangeable structure
6.3.3 Random-coefficient structure
6.3.4 Autoregressive and exponential structures
6.3.5 Moving-average residual structure
6.3.6 Banded and Toeplitz structures
6.4.1 Random effects and correlated level-1 residuals
6.4.2 Heteroskedastic level-1 residuals over occasions
6.4.3 Heteroskedastic level-1 residuals over groups
6.4.4 Different covariance matrices over groups
6.5 Comparing the fit of marginal models 6.4.2 Heteroskedastic level-1 residuals over occasions
6.4.3 Heteroskedastic level-1 residuals over groups
6.4.4 Different covariance matrices over groups
6.6 Generalized estimating equations (GEE)
6.7 Marginal modeling with few units and many occasions
6.7.1 Is a highly organized labor market beneficial for economic growth?
6.7.2 Marginal modeling for long panels
6.7.3 Fitting marginal models for long panels in Stata
6.8 Summary and further reading 6.7.2 Marginal modeling for long panels
6.7.3 Fitting marginal models for long panels in Stata
6.9 Exercises
7 Growth-curve models
7.1 Introduction
7.2 How do children grow?
7.5 Heteroskedasticity
7.7 Growth-curve model as a structural equation model
7.9 Exercises
7.2 How do children grow?
7.2.1 Observed growth trajectories
7.3 Models for nonlinear growth
7.3.1 Polynomial models
7.4 Two-stage model formulation
Fitting the models
Predicting the mean trajectory
Predicting trajectories for individual children
7.3.2 Piecewise linear models Predicting the mean trajectory
Predicting trajectories for individual children
Fitting the models
Predicting the mean trajectory
Predicting the mean trajectory
7.5 Heteroskedasticity
7.5.1 Heteroskedasticity at level 1
7.5.2 Heteroskedasticity at level 2
7.6 How does reading improve from kindergarten through third grade? 7.5.2 Heteroskedasticity at level 2
7.7 Growth-curve model as a structural equation model
7.7.1 Estimation using sem
7.7.2 Estimation using xtmixed
7.8 Summary and further reading 7.7.2 Estimation using xtmixed
7.9 Exercises
IV Models with nested and crossed random effects
8 Higher-level models with nested random effects
8.1 Introduction
8.2 Do peak-expiratory-flow measurements vary between methods within subjects?
8.3 Inspecting sources of variability
8.4 Three-level variance-components models
8.5 Different types of intraclass correlation
8.6 Estimation using xtmixed
8.7 Empirical Bayes prediction
8.8 Testing variance components
8.9 Crossed versus nested random effects revisited
8.10 Does nutrition affect cognitive development of Kenyan children?
8.11 Describing and plotting three-level data
8.15 Summary and further reading
8.16 Exercises
8.2 Do peak-expiratory-flow measurements vary between methods within subjects?
8.3 Inspecting sources of variability
8.4 Three-level variance-components models
8.5 Different types of intraclass correlation
8.6 Estimation using xtmixed
8.7 Empirical Bayes prediction
8.8 Testing variance components
8.9 Crossed versus nested random effects revisited
8.10 Does nutrition affect cognitive development of Kenyan children?
8.11 Describing and plotting three-level data
8.11.1 Data structure and missing data
8.11.2 Level-1 variables
8.11.3 Level-2 variables
8.11.4 Level-3 variables
8.11.5 Plotting growth trajectories
8.12 Three-level random-intercept model 8.11.2 Level-1 variables
8.11.3 Level-2 variables
8.11.4 Level-3 variables
8.11.5 Plotting growth trajectories
8.12.1 Model specification: Reduced form
8.12.2 Model specification: Three-stage formulation
8.12.3 Estimation using xtmixed
8.13 Three-level random-coefficient models 8.12.2 Model specification: Three-stage formulation
8.12.3 Estimation using xtmixed
8.13.1 Random coefficient at the child level
8.13.2 Random coefficient at the child and school levels
8.14 Residual diagnostics and predictions 8.13.2 Random coefficient at the child and school levels
8.15 Summary and further reading
8.16 Exercises
9 Crossed random effects
9.1 Introduction
9.2 How does investment depend on expected profit and capital stock?
9.3 A two-way error-components model
9.5 Data structure
9.6 Additive crossed random-effects model
9.9 Summary and further reading
9.10 Exercises
9.2 How does investment depend on expected profit and capital stock?
9.3 A two-way error-components model
9.3.1 Model specification
9.3.2 Residual variances, covariances, and intraclass correlations
9.3.4 Prediction
9.4 How much do primary and secondary schools affect attainment at age 16? 9.3.2 Residual variances, covariances, and intraclass correlations
Longitudinal correlations
Cross-sectional correlations
9.3.3 Estimation using xtmixed Cross-sectional correlations
9.3.4 Prediction
9.5 Data structure
9.6 Additive crossed random-effects model
9.6.1 Specification
9.6.2 Estimation using xtmixed
9.7 Crossed random-effects model with random interaction 9.6.2 Estimation using xtmixed
9.7.1 Model specification
9.7.2 Intraclass correlations
9.7.3 Estimation using xtmixed
9.7.4 Testing variance components
9.7.5 Some diagnostics
9.8 A trick requiring fewer random effects 9.7.2 Intraclass correlations
9.7.3 Estimation using xtmixed
9.7.4 Testing variance components
9.7.5 Some diagnostics
9.9 Summary and further reading
9.10 Exercises
A Useful Stata commands
References
Author index
(pdf)
Subject index
(pdf)
List of Tables
List of Figures
V Models for categorical responses
10.1 Introduction
10.2 Single-level logit and probit regression models for dichotomous responses
10.4 Longitudinal data structure
10.5 Proportions and fitted population-averaged or marginal probabilities
10.6 Random-intercept logistic regression
10.9 Measures of dependence and heterogeneity
10.16 Exercises
10.2 Single-level logit and probit regression models for dichotomous responses
10.2.1 Generalized linear model formulation
10.2.2 Latent-response formulation
10.3 Which treatment is best for toenail infection? 10.2.2 Latent-response formulation
Logistic regression
Probit regression
Probit regression
10.4 Longitudinal data structure
10.5 Proportions and fitted population-averaged or marginal probabilities
10.6 Random-intercept logistic regression
10.6.1 Model specification
10.7 Estimation of random-intercept logistic models
Reduced-form specification
Two-stage formulation
Two-stage formulation
10.7.1 Using xtlogit
10.7.2 Using xtmelogit
10.7.3 Using gllamm
10.8 Subject-specific or conditional vs. population-averaged or marginal
relationships 10.7.2 Using xtmelogit
10.7.3 Using gllamm
10.9 Measures of dependence and heterogeneity
10.9.1 Conditional or residual intraclass correlation of the latent
responses
10.9.2 Median odds ratio
10.9.3 Measures of association for observed responses at median fixed part of the model
10.10 Inference for random-intercept logistic models 10.9.2 Median odds ratio
10.9.3 Measures of association for observed responses at median fixed part of the model
10.10.1 Tests and confidence intervals for odds ratios
10.10.2 Tests of variance components
10.11 Maximum likelihood estimation 10.10.2 Tests of variance components
10.11.1 Adaptive quadrature
10.11.2 Some speed and accuracy considerations
10.12 Assigning values to random effects 10.11.2 Some speed and accuracy considerations
Advice for speeding up estimation in gllamm
10.12.1 Maximum “likelihood” estimation
10.12.2 Empirical Bayes prediction
10.12.3 Empirical Bayes modal prediction
10.13 Different kinds of predicted probabilities 10.12.2 Empirical Bayes prediction
10.12.3 Empirical Bayes modal prediction
10.13.1 Predicted population-averaged or marginal probabilities
10.13.2 Predicted subject-specific probabilities
10.14 Other approaches to clustered dichotomous data 10.13.2 Predicted subject-specific probabilities
Predictions for hypothetical subjects: Conditional probabilities
Predictions for the subjects in the sample: Posterior mean probabilities
Predictions for the subjects in the sample: Posterior mean probabilities
10.14.1 Conditional logistic regression
10.14.2 Generalized estimating equations (GEE)
10.15 Summary and further reading 10.14.2 Generalized estimating equations (GEE)
10.16 Exercises
11 Ordinal responses
11.1 Introduction
11.2 Single-level cumulative models for ordinal responses
11.4 Longitudinal data structure and graphs
11.10 A random-intercept probit model with grader bias
11.14 Summary and further reading
11.15 Exercises
11.2 Single-level cumulative models for ordinal responses
11.2.1 Generalized linear model formulation
11.2.2 Latent-response formulation
11.2.3 Proportional odds
11.2.4 Identification
11.3 Are antipsychotic drugs effective for patients with schizophrenia? 11.2.2 Latent-response formulation
11.2.3 Proportional odds
11.2.4 Identification
11.4 Longitudinal data structure and graphs
11.4.1 Longitudinal data structure
11.4.2 Plotting cumulative proportions
11.4.3 Plotting cumulative sample logits and transforming the time scale
11.5 A single-level proportional odds model 11.4.2 Plotting cumulative proportions
11.4.3 Plotting cumulative sample logits and transforming the time scale
11.5.1 Model specification
11.5.2 Estimation using Stata
11.6 A random-intercept proportional odds model 11.5.2 Estimation using Stata
11.6.1 Model specification
11.6.2 Estimation using Stata
11.6.3 Measures of dependence and heterogeneity
11.7 A random-coefficient proportional odds model 11.6.2 Estimation using Stata
11.6.3 Measures of dependence and heterogeneity
Residual intraclass correlation of latent responses
Median odds ratio
Median odds ratio
11.7.1 Model specification
11.7.2 Estimation using gllamm
11.8 Different kinds of predicted probabilities 11.7.2 Estimation using gllamm
11.8.1 Predicted population-averaged or marginal probabilities
11.8.2 Predicted subject-specific probabilities: Posterior mean
11.9 Do experts differ in their grading of student essays? 11.8.2 Predicted subject-specific probabilities: Posterior mean
11.10 A random-intercept probit model with grader bias
11.10.1 Model specification
11.10.2 Estimation using gllamm
11.11 Including grader-specific measurement error variances 11.10.2 Estimation using gllamm
11.11.1 Model specification
11.11.2 Estimation using gllamm
11.12 Including grader-specific thresholds 11.11.2 Estimation using gllamm
11.12.1 Model specification
11.12.2 Estimation using gllamm
11.13 Other link functions 11.12.2 Estimation using gllamm
Cumulative complementary log-log model
Continuation-ratio logit model
Adjacent-category logit model
Baseline-category logit and stereotype models
Continuation-ratio logit model
Adjacent-category logit model
Baseline-category logit and stereotype models
11.15 Exercises
12 Nominal responses and discrete choice
12.1 Introduction
12.2 Single-level models for nominal responses
12.4 Utility-maximization formulation
12.5 Does marketing affect choice of yogurt?
12.6 Single-level conditional logit models
12.9 Summary and further reading
12.10 Exercises
12.2 Single-level models for nominal responses
12.2.1 Multinomial logit models
12.2.2 Conditional logit models
12.3 Independence from irrelevant alternatives 12.2.2 Conditional logit models
Classical conditional logit models
Conditional logit models also including covariates that vary only over units
Conditional logit models also including covariates that vary only over units
12.4 Utility-maximization formulation
12.5 Does marketing affect choice of yogurt?
12.6 Single-level conditional logit models
12.6.1 Conditional logit models with alternative-specific intercepts
12.7 Multilevel conditional logit models
12.7.1 Preference heterogeneity: Brand-specific random intercepts
12.7.2 Response heterogeneity: Marketing variables with random coefficients
12.7.3 Preference and response heterogeneity
12.8 Prediction of random effects and response probabilities 12.7.2 Response heterogeneity: Marketing variables with random coefficients
12.7.3 Preference and response heterogeneity
Estimation using gllamm
Estimation using mixlogit
Estimation using mixlogit
12.9 Summary and further reading
12.10 Exercises
VI Models for counts
13 Counts
13.1 Introduction
13.2 What are counts?
13.4 Did the German health-care reform reduce the number of doctor visits?
13.5 Longitudinal data structure
13.6 Single-level Poisson regression
13.11 Other approaches to two-level count data
13.13 Which Scottish counties have a high risk of lip cancer?
13.14 Standardized mortality ratios
13.15 Random-intercept Poisson regression
13.18 Exercises
13.2 What are counts?
13.2.1 Counts versus proportions
13.2.2 Counts as aggregated event-history data
13.3 Single-level Poisson models for counts 13.2.2 Counts as aggregated event-history data
13.4 Did the German health-care reform reduce the number of doctor visits?
13.5 Longitudinal data structure
13.6 Single-level Poisson regression
13.6.1 Model specification
13.6.2 Estimation using Stata
13.7 Random-intercept Poisson regression 13.6.2 Estimation using Stata
13.7.1 Model specification
13.7.2 Measures of dependence and heterogeneity
13.7.3 Estimation using Stata
13.8 Random-coefficient Poisson regression 13.7.2 Measures of dependence and heterogeneity
13.7.3 Estimation using Stata
Using xtpoisson
Using xtmepoisson
Using gllamm
Using xtmepoisson
Using gllamm
13.8.1 Model specification
13.8.2 Estimation using Stata
13.9 Overdispersion in single-level models 13.8.2 Estimation using Stata
Using xtmepoisson
Using gllamm
13.8.3 Interpretation of estimates Using gllamm
13.9.1 Normally distributed random intercept
13.9.2 Negative binomial models
13.10 Level-1 overdispersion in two-level models 13.9.2 Negative binomial models
Mean dispersion or NB2
Constant dispersion or NB1
13.9.3 Quasilikelihood Constant dispersion or NB1
13.11 Other approaches to two-level count data
13.11.1 Conditional Poisson regression
13.11.2 Conditional negative binomial regression
13.11.3 Generalized estimating equations
13.12 Marginal and conditional effects when responses are MAR 13.11.2 Conditional negative binomial regression
13.11.3 Generalized estimating equations
13.13 Which Scottish counties have a high risk of lip cancer?
13.14 Standardized mortality ratios
13.15 Random-intercept Poisson regression
13.15.1 Model specification
13.15.2 Estimation using gllamm
13.15.3 Prediction of standardized mortality ratios
13.16 Nonparametric maximum likelihood estimation 13.15.2 Estimation using gllamm
13.15.3 Prediction of standardized mortality ratios
13.16.1 Specification
13.16.2 Estimation using gllamm
13.16.3 Prediction
13.17 Summary and further reading 13.16.2 Estimation using gllamm
13.16.3 Prediction
13.18 Exercises
VII Models for survival or duration data
Introduction to models for survival or duration data (part VII)
14 Discrete-time survival
14.1 Introduction
14.2 Single-level models for discrete-time survival data
14.4 Data expansion
14.5 Proportional hazards and interval-censoring
14.6 Complementary log-log models
14.7 A random-intercept complementary log-log model
14.9 Summary and further reading
14.10 Exercises
14.2 Single-level models for discrete-time survival data
14.2.1 Discrete-time hazard and discrete-time survival
14.2.2 Data expansion for discrete-time survival analysis
14.2.3 Estimation via regression models for dichotomous responses
14.2.4 Including covariates
14.2.6 Handling left-truncated data
14.3 How does birth history affect child mortality? 14.2.2 Data expansion for discrete-time survival analysis
14.2.3 Estimation via regression models for dichotomous responses
14.2.4 Including covariates
Time-constant covariates
Time-varying covariates
14.2.5 Multiple absorbing events and competing risks Time-varying covariates
14.2.6 Handling left-truncated data
14.4 Data expansion
14.5 Proportional hazards and interval-censoring
14.6 Complementary log-log models
14.7 A random-intercept complementary log-log model
14.7.1 Model specification
14.7.2 Estimation using Stata
14.8 Population-averaged or marginal vs. subject-specific or conditional
survival probabilities 14.7.2 Estimation using Stata
14.9 Summary and further reading
14.10 Exercises
15 Continuous-time survival
15.1 Introduction
15.2 What makes marriages fail?
15.3 Hazards and survival
15.4 Proportional hazards models
15.7 Does nitrate reduce the risk of angina pectoris?
15.8 Marginal modeling
15.14 Exercises
15.2 What makes marriages fail?
15.3 Hazards and survival
15.4 Proportional hazards models
15.4.1 Piecewise exponential model
15.4.2 Cox regression model
15.4.3 Poisson regression with smooth baseline hazard
15.5 Accelerated failure-time models 15.4.2 Cox regression model
15.4.3 Poisson regression with smooth baseline hazard
15.5.1 Log-normal model
15.6 Time-varying covariates 15.7 Does nitrate reduce the risk of angina pectoris?
15.8 Marginal modeling
15.8.1 Cox regression
15.8.2 Poisson regression with smooth baseline hazard
15.9 Multilevel proportional hazards models 15.8.2 Poisson regression with smooth baseline hazard
15.9.1 Cox regression with gamma shared frailty
15.9.2 Poisson regression with normal random intercepts
15.9.3 Poisson regression with normal random intercept and random coefficient
15.10 Multilevel accelerated failure-time models 15.9.2 Poisson regression with normal random intercepts
15.9.3 Poisson regression with normal random intercept and random coefficient
15.10.1 Log-normal model with gamma shared frailty
15.10.2 Log-normal model with log-normal shared frailty
15.11 A fixed-effects approach 15.10.2 Log-normal model with log-normal shared frailty
15.11.1 Cox regression with subject-specific baseline hazards
15.12 Different approaches to recurrent-event data
15.12.1 Total time
15.12.2 Counting process
15.12.3 Gap time
15.13 Summary and further reading 15.12.2 Counting process
15.12.3 Gap time
15.14 Exercises
VIII Models with nested and crossed random effects
16 Models with nested and crossed random effects
16.1 Introduction
16.2 Did the Guatemalan immunization campaign work?
16.3 A three-level random-intercept logistic regression model
16.6 Estimation of three-level random-coefficient logistic regression models
16.10 Crossed random-effects logistic regression
16.11 Summary and further reading
16.12 Exercises
16.2 Did the Guatemalan immunization campaign work?
16.3 A three-level random-intercept logistic regression model
16.3.1 Model specification
16.3.2 Measures of dependence and heterogeneity
16.4 Estimation of three-level random-intercept logistic regression models 16.3.2 Measures of dependence and heterogeneity
Types of residual intraclass correlations of the latent responses
Types of median odds ratios
16.3.3 Three-stage formulation Types of median odds ratios
16.4.1 Using gllamm
16.4.2 Using xtmelogit
16.5 A three-level random-coefficient logistic regression model 16.4.2 Using xtmelogit
16.6 Estimation of three-level random-coefficient logistic regression models
16.6.1 Using gllamm
16.6.2 Using xtmelogit
16.7 Prediction of random effects 16.6.2 Using xtmelogit
16.7.1 Empirical Bayes prediction
16.7.2 Empirical Bayes modal prediction
16.8 Different kinds of predicted probabilities 16.7.2 Empirical Bayes modal prediction
16.8.1 Predicted population-averaged or marginal probabilities: New clusters
16.8.2 Predicted median or conditional probabilities
16.8.3 Predicted posterior mean probabilities: Existing clusters
16.9 Do salamanders from different populations mate successfully? 16.8.2 Predicted median or conditional probabilities
16.8.3 Predicted posterior mean probabilities: Existing clusters
16.10 Crossed random-effects logistic regression
16.11 Summary and further reading
16.12 Exercises
A Syntax for gllamm, eq, and gllapred: The bare essentials
B Syntax for gllamm
C Syntax for gllapred
D Syntax for gllasim
References
Author index
(pdf)
Subject index
(pdf)
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