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Re: st: Contour plot help


From   Bill Rising <brising@stata.com>
To   Stata Listserv <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Contour plot help
Date   Tue, 26 Feb 2013 17:57:49 -0600

Carolina Echevarria <bebaechevarria@gmail.com> asked about making a contour plot from the results of -margins- similar to that shown on the last slide of
  http://www.stata.com/meeting/chicago11/materials/chi11_rising.pdf

She was running a -logit-, followed by -margins-, followed by -estimates store-

> quietly logit outcome varX varY 
> margins, at( varX=(1(0.5)5))
> I try to save the margins using estimates store, but didnt work

To get the two dimensions for the x and y variables in the contour plot, she needs to also have some values for varY (see below).

Instead of using -estimates store- to create a dataset for the graph she needs to use the undocumented function _marg_save, which is used to create a dataset from the margins.

Here are a few lines of code which put the margins in the dataset named forContour.dta, which I am happy to overwrite, as its only purpose is to make the graph. I made up values for the varY variable, but she should use useful ones:

  margins, at( varX=(1(0.5)5) varY=(10(1)20))
  _marg_save, saving(forContour, replace) 
  preserve // so the original dataset can be recovered
  use forContour, clear
  twoway contour _merge _at1 _at2, ccuts(0(0.05)0.5)  
  restore // to recover the original dataset

For future reference: here is a zip file containing the do-file used to make the graph in the talk:
  http://www.stata.com/meeting/chicago11/materials/chi11_rising_files.zip

Cheers,

Bill Rising
brising@stata.com  
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