>> Home >> Products >> Stata 14 >> Postestimation Selector
Stata Release 14: Available now

Postestimation Selector

Postestimation Selector


Highlights

  • Easily find and use any postestimation analysis tool
  • List of all postestimation features available for your model
  • Automatically updates as new models are estimated
  • Available after every Stata estimation command
graph

What's this about?

As you fit models, Stata's new Postestimation Selector shows you postestimation statistics, tests, and predictions that you could use right now.

Let's see it work

Suppose we have just fit a linear regression of systolic blood pressure on age, weight, and an indicator for females.

. regress bpsystol age weight i.female

Source SS df MS Number of obs = 10,351
F(3, 10347) = 1501.75
Model 1709209.9 3 569736.633 Prob > F = 0.0000
Residual 3925460.13 10,347 379.381476 R-squared = 0.3033
Adj R-squared = 0.3031
Total 5634670.03 10,350 544.412563 Root MSE = 19.478
bpsystol Coef. Std. Err. t P>|t| [95% Conf. Interval]
age .6374325 .0111334 57.25 0.000 .6156088 .6592562
weight .4170339 .013474 30.95 0.000 .3906221 .4434456
1.female .8244702 .4140342 1.99 0.046 .0128832 1.636057
_cons 70.13615 1.187299 59.07 0.000 67.80881 72.46348

What's next? How can we check to see whether any assumptions of the model have been violated? Can we compare the model we just fit to the more complex model we may have fit previously? Can we save our estimation results so that we can use them again later? How do we know which of Stata's hundreds, if not thousands, of postestimation features are available after the model we just fit?

The Postestimation Selector provides a list of all postestimation tools available after fitting our model and provides two-click access to the corresponding dialog boxes.

graph

We have selected Residual-versus-predictor plot. We click on Launch, the dialog box opens, and we create our graph. The Postestimation Selector will remain open so that we can perform the rest of our analysis. For instance, we can select Tests for heteroskedasticity and open the dialog box to perform a Breusch–Pagan test.

We recommend that you leave the Postestimation Selector open at all times.

Next, we decide to fit a logistic regression model for highbp, a variable that is one when the subject's blood pressure is clinically high and is zero otherwise.

. logistic highbp age weight i.female

Logistic regression                             Number of obs     =     10,351
                                                LR chi2(3)        =    2326.44
                                                Prob > chi2       =     0.0000
Log likelihood = -5887.5446                     Pseudo R2         =     0.1650

highbp Odds Ratio Std. Err. z P>|z| [95% Conf. Interval]
age 1.052054 .0014852 35.95 0.000 1.049147 1.054969
weight 1.044683 .001759 25.96 0.000 1.041242 1.048137
1.female 1.036659 .0498306 0.75 0.454 .9434528 1.139074
_cons .002525 .0004077 -37.05 0.000 .0018401 .003465

As soon as our new model is estimated, the Postestimation Selector updates and shows us the postestimation tools that are now available.

graph

While we could have found a list of available postestimation commands from the help file for logistic postestimation, the Postestimation Selector is more specialized. It lists only postestimation features available for the exact model that was fit, adjusting for any options or prefixes that were specified. Notice what happens when we take into account the complex survey nature of this dataset by specifying the svy prefix with our command.

. svy: logistic highbp age weight i.female
(running logistic on estimation sample)

Survey: Logistic regression

Number of strata   =        31                Number of obs     =       10,351
Number of PSUs     =        62                Population size   =  117,157,513
                                              Design df         =           31
                                              F(   3,     29)   =       449.71
                                              Prob > F          =       0.0000

Linearized
highbp Odds Ratio Std. Err. t P>|t| [95% Conf. Interval]
age 1.054031 .0017933 30.93 0.000 1.05038 1.057695
weight 1.046507 .0021333 22.30 0.000 1.042165 1.050867
1.female .9388421 .055388 -1.07 0.293 .832409 1.058884
_cons .0021719 .0004316 -30.86 0.000 .0014482 .0032572

We find that some of the diagnostics and goodness-of-fit statistics that were available previously are no longer listed and that there is a new list of postestimation features that are available only when fitting models to complex survey data.

graph

We can use the Postestimation Selector to guide us to the postestimation tools that are available after any model that we fit, and with any combinations of options or prefixes.

Tell me more

For more information, see the manual entry on the Postestimation Selector.

Also read the overview from the Stata News.

Upgrade now Order Stata

Stata

Shop

Support

Company


The Stata Blog: Not Elsewhere Classified Find us on Facebook Follow us on Twitter LinkedIn Google+ YouTube
© Copyright 1996–2016 StataCorp LP   •   Terms of use   •   Privacy   •   Contact us