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st: Wish List for margins


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Wish List for margins
Date   Tue, 31 Aug 2010 23:11:28 -0500

I'm forcing myself to use the -margins- command and I am starting to like and understand it better. Some things I'd like to see (or else maybe somebody can tell me how to do them already):

* I'd like a -discrete- option that would tell margins to treat a 0/1 dichotomy as a dichotomy. This would make margins more useful with older user-written commands (like mine) that do not currently support the use of factor variables.

* Perhaps the syntax would be tricky, but I am a little surprised there isn't a generate option. The old adjust command has one. You might want to see, say, what the predicted probability for a case is given the values you have fixed using the -at- option.

* As far as I can tell, marginal effects after multiple-outcome commands are still clunky to generate. You have to give a separate margins command for each outcome. I wish margins acted like the user-written mfx2 and margeff commands, generating all the marginal effects for every outcome with a single command.

* Like I've said before, I wish the old adjust and mfx commands had been updated for Stata 11. One thing they would need added is an -asobserved- option, which is the default for margins. At 50 pages, the manual entry for margins is a little daunting. I think it would be easier to understand if there were simpler commands that focused on specific tasks.

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Richard Williams, Notre Dame Dept of Sociology
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EMAIL:  Richard.A.Williams.5@ND.Edu
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