Dear Stata Users:
I am a fairly new Stata user who is trying to do nonlinear least squares.
I am using Version 7.
I successfully set up the problem by writing the nlfcn program as a do-file.
When I try to run the regression, I get a message such as:
. nl nonlinear averagem1
__000057 not found
could not restore sort order because variables were dropped
r(111);
I don't know what __000057 is. It is not anything I have deliberately created.
Each time I rerun the regression, the thing "not found," e.g., __000057 above,
changes to a different number.
I have not "dropped" any variables from the data set.
Please, what is going on and how can I fix it?
Many thanks.
Dale
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