st: nl: missing standar error

[chw_wagner@gmx.de]

Dear StataList,

I have the following problem. I am trying to run a non-linear regression in Stata 11. I am using a test case to try my programmed codes before I use my real data set. This test case does not contain the variables, which I will use later on in my analyses, but at least it has a panel structure which is important for me.

I programmed my function using the nl command. Then I run the model with the test case. Until this point the codes are working. If I run the regression commands with my real data set, Stata will not display one standard error for one specific coefficient of a variable, even though Stata did it for my test data. I have tried to make my observations more homogeneous, but it is still not working.

Could you please give me a hint how to identify the problem? I have no idea, why Stata is not reporting this standard error when I am using my real data set. For me, the programming code looks the same except that I have to replace my variables according to the variables in the test case.

Thank you in advance

Christina
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