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Sample size and power determination
- Two-sample test of equality of means
- One-sample test of means
- Two-sample test of equality of proportions
- One-sample test of proportions
- Repeated measurements of the outcome on each experimental unit
- Survival studies
Generalized method of moments (GMM)
- Linear and nonlinear models
- One-step, two-step, and iterative estimators
- Cross-sectional, time-series, and panel models
- Easily specify panel-style instruments
- Interactive and programmable versions
Nonlinear least-squares
regression
Nonlinear seemingly unrelated regression
Stepwise regression
- Linear
- Complementary log-log
- Cox
- GLM
- Interval
- Logistic
- Conditional logistic
- Negative binomial
- Ordered logit
- Ordered probit
- Poisson
- Probit
- Quantile
- Skewed logistic
- Tobit and censored-normal
- Exponential, Weibull, Gompertz, lognormal, loglogistic, generalized gamma
Nested-model statistics
Orthogonal polynomials
Cronbach’s alpha
Kappa measure of interrater agreement
Kernel-density estimation
Box–Cox transform
- Can be applied to the left-hand side, right-hand side, or both
- Parameters can be the same or different
- Maximum likelihood
- Zero-skewness log
Power transforms
- Search for power transform that converts a variable into a normally
distributed variable
- Graphical display of a power-transformed variable
Tests of normality
- Shapiro–Wilk
- Shapiro–Francia
- Skewness and kurtosis test (D’Agostino, with and without Royston
correction)
- Doornik–Hansen
- Henze–Zirkler
- Two by Mardia
Collecting statistics into a dataset
- Collection from any command
- Collection of results for each group or subgroup of observations
- Collection from user-written or “official” commands
Drawing samples from multivariate normal distribution
Creating datasets with specified correlation structure
Rolling and recursive analyses
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Mathematical functions
- Absolute value
- Arccosine returning radians
- Arcsine returning radians
- Arctangent returning radians
- Two-argument arctangent
- Sine of radians
- Tangent of radians
- Cosine of radians
- Combinatorial function
- Exponentiation
- Natural logarithm
- Natural log factorial
- ln(gamma(x)) (ln((x−1)!) for integer x)
- Base 10 logarithm
- Modulus of x with respect to y
- Square root
- Digamma function
- Trigamma function
- Hyperbolic sine
- Hyperbolic cosine
- Hyperbolic arcsine
- Hyperbolic arccosine
- Hyperbolic tangent
- Log of odds ratio
- Inverse log of odds ratio
- Complementary log-log
- Inverse complementary log-log
- Ceiling
- Floor
- Minimum
- Maximum
- Relative difference
- Running sum
- Sign
Statistical functions
- Binomial cumulative probability
- Binomial probability
- Cumulative and inverse F distribution
- F density
- Incomplete gamma
- Inverse incomplete gamma
- Gamma density
- Incomplete beta
- Noncentral beta density
- Inverse binomial
- Cumulative and inverse chi-squared
- Inverse cumulative noncentral chi-squared
- Upper tail of cumulative beta distribution
- Inverse tail of cumulative beta distribution
- Upper tail of cumulative gamma distribution
- Inverse tail of cumulative gamma distribution
- Upper tail of right cumulative binomial
- Cumulative noncentral chi-squared
- Standard normal density
- Cumulative normal
- Inverse cumulative normal
- Bivariate normal
- Cumulative bivariate normal
- Student’s 2-tailed t distribution
- t density
- Inverse 2-tailed cumulative t distribution
- Noncentrality parameter L for noncentral chi-squared
- First and second derivatives of gamma
- Noncentral F
- Hypergeometric cumulative probability
- Hypergeometric probability
- Negative binomial cumulative probability
- Negative binomial probability
- Negative binomial reverse cumulative probability
- Inverse cumulative negative binomial probability
- Inverse tail of cumulative negative binomial probability
- Poisson cumulative probability
- Poisson probability
- Poisson reverse cumulative probability
- Inverse cumulative Poisson probability
- Inverse tail of cumulative Poisson probability
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