Hi,
Thanks all for your advice. I tried the methods that Richard suggested,
but still I could not solve the problem.
I tried to use the command -set trace on- before I run reoprob, but I
couldn't figure out what really happened when the program dies because
the calculation is too complicated.
Also, I used the actual y variable name and replaced the xi with the
real dummites, but it didn't change anything.
The third way seems most informative to this problem. I used regoprob
with -pl- option instead of reoprob. It turned out to be that it
stopped at the same place where reoprob couldn't run through, but using
-regoprob- gives more informative error message. It said that
"insufficient observations" when it died. I have a further question
about this though-- what does this error message really mean? I am
talking about using a panel data set with 3,960 observations (N=660,
T=6) to estimate about 47 parameters in a random effects ordered probit
model. Is the sample size too small here? Thanks!
Jinhu
> You might also try using regoprob, available from SSC. Same syntax
> as what you have, except add the -pl- option at the end of your
> command.
On Thu, 24 Apr 2008 23:13:27 -0500
Richard Williams <[email protected]> wrote:
> At 08:53 PM 4/24/2008, J. Li wrote:
> >Hi all,
> >
> >I am using -reoprob- to estimate a dynamic ordered probit panel data
> >model with random effects. The dependent variable is self-assessed
> >health status with 5 ranks and only the first lag is included in the
> >regressor list. I got some strange error message for some of my
> >regressions. The command I used is as following:
> >
> >xi: reoprob $yvar hlthclag1 hlthclag2 hlthclag3 hlthclag5 agec
> genderc
> >i.area fsize birthage lnhincome schoolm2 schoolm3 schoolm4 schoolf2
> >schoolf3 schoolf4 pmkfe pmknm mlnhincome mschoolm mschoolf if
> >qpropeducu==1, i(persruk)
> >
> >
> >The error message showed up when fitting the constant-only model as
> >following:
> >
> >__00000W not found
> >
> >
> >What might be the problem here? Thanks very much!
>
> There is a temporary variable it cannot find for some reason. Before
> running reoprob, you can give the command -set trace on- and then
> look to see what is happening when the program dies. The problem may
> or may not be obvious.
>
> I would also use the actual y variable name rather than $yvar, and I
> would compute the area dummies beforehand rather than use xi. It
> probably won't matter, but then again the simpler your syntax perhaps
> the less likely it is that reoprob will make a mistake.
>
> You might also try using regoprob, available from SSC. Same syntax
> as what you have, except add the -pl- option at the end of your
> command.
>
>
> -------------------------------------------
> Richard Williams, Notre Dame Dept of Sociology
> OFFICE: (574)631-6668, (574)631-6463
> HOME: (574)289-5227
> EMAIL: [email protected]
> WWW: http://www.nd.edu/~rwilliam
>
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