Dear all,
I am trying to estimate marginal effects after -regoprob-. I need to
estimate marginal effects at some specific values of my dependent
variables.
So let's say I estimated the following model:
regoprob y x1 x2...x40 z1 z2 ... z30, i(pid) npl(x1 x2)
Then I want to get the marginal effects using
mfx2, m varlist(x1) at(z1=0, z2=0,…z10...,z30=0)
or
mfx, predict(p outcome(1)) varlist(x1) at(z1=0, z2=0,…z10...,z30=0)
mfx, predict(p outcome(2)) varlist(x1) at(z1=0, z2=0,…z10...,z30=0)
....
Both -mfx2- and –mfx- seem to work, but both the commands return a
warning that reads:
"-warning: variables z10 ...z30 in at() list not found in model-
I checked repeatedly and those variables are (and must be) in the model.
I then wondered if there was a maximum number that could be dealt with
by the -at()- option. Playing with my model I found out that I stop to
get that warning when I have less than 10 variables in -at()-
I was therefore trying to write an example for statalist using some
generated datasets, but no examples display the above behaviour (error
messages), i.e. I never got that warning message and –mfx- or -mfx2-
worked smoothly.
Is it possible that the problem is the actual length of the –at()-
option rather than the number of variables?
Thank you
Mirko
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
