st: relax the convergence criteria in ivprobit model

[xueliansharon <xuelianstata@gmail.com>]

Hi,

When I run the ivprobit model in Stata, sometimes the ivprobit model doesn't
converge under the default convergence criteria, however, when I relax the
criteria a bit, e.g. relaxing it from 1e-7 to 2e-7, the model converges. And
when I try different sets of IVs, the coefficient estimates are quite
similar. 

Are the coefficients gotten under such relaxed convergence criteria
reliable? 

Another question: in the help file of "maximize", it says that
"nrtolerance(#) specifies the tolerance for the scaled gradient. 
Convergence is declared when g*inv(H)*g' < nrtolerance(). The default is
nrtolerance(1e-5)." However, when I run ivprobit in the reality, I find that
the default value for nrtol is (1e-7), not (1e-5). Any explanation about
this?

Thanks for your response in advance.

Sharon

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