I get a error r(480) when trying to estimate a non linear function in STATA?

06 September 2022 0 1K Report

The error reads "starting values invalid or some RHS variables have missing values" while trying to estimate using nl command. My expression reads:

ln(y)=a+ln b1.(x1)+ln b2.(x2)+.......+ln b6.(x6)+ln(1-e(-b7.(x7)).

I used the nl command because the last expression on the right hand side has an exponential form inside the log.

How do I estimate this function?
Can this be estimated using nl command?
Are there some other ways to estimate this?

Thanks.

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