st: Ramsey RESET test on a Tobit and a Poisson Pseudo-Maximum Likelihood model?

[Carly Petracco <carly.k.p@gmail.com>]

How do I run a Ramsey RESET test on a Tobit and a Poisson
Pseudo-Maximum Likelihood model? I am running a gravity model on trade
and migration data and I am trying to replicate the procedure I have
already seen. And I know it is possible as I have read three papers
that present the results, but I keep running into errors when I try to
run it.

After running my tobit command
 . tobit log_export log_migStock gdpProd ldist lremote pop2010
 . est store Export
 . ovtest
last estimates not found
r(301);

 . ovtest Export
last estimates not found
r(301);

I get this error when I use the 'ovtest' (since I have stata 10.1 and
so I am not using the new command 'estat ovtest' after the tobit model
and after the Poisson model.
Is there a line of code I am missing? Should I be running mfx after
the tobit (even though I have tried this and I still have the same
error)?

Any help is greatly appreciated!

Thanks,
Charlee

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