Re: st: mfx after svy: probit - "invalid e(rules) matrix" error

[Richard Williams <Richard.A.Williams.5@ND.edu>]

At 01:28 PM 2/4/2006, Erin Strumpf wrote:
> I'd like to calculate marginal effects after running a svy: probit 
> regression, and since dprobit isn't available for survey commands, I'm running:
>
> xi: svy, subpop(temp): probit rfullret tx2 i.ragey_e rfemale 
> i.rraceeth i.raedcat
> mfx
>
> the regression runs fine, but then I get the following error:
> invalid e(rules) matrix
> r(322);
>
> and the mfx command doesn't run.  I have searched the Stata help 
> files, the Stata list, and the internet for this mysterious r(322) 
> error, and I haven't come up with anything.  Does anyone have any 
> ideas what is going wrong here?
>
> thanks,
> Erin
. error 322
something that should be true of your estimation results is not

I don't have your data.  But, when I run a different problem with 
svy: probit I do not encounter this error.  So, I would say

* Make sure you have the latest update of Stata

* Try it without the svy: prefix and see if it works.

* You could also try installing and running the -margeff- 
command.  However, I am not sure if it works correctly with -svyset- 
data or not.


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