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  • Heckman Error in First stage

    Hi
    I run the Heckman two step selection model by using following stata code. I am using stata 15.1 v.

    heckman DV IV control_cariavle i.year i.industry , twostep select(IV = x2 x3 x4 x5 x6) rhosigma vce(conventional) first

    After running the code, in first stage coef has value but Std.Err, z, P>|z|, [95% conf. Interval] does have any value. Please see the image below.
    Click image for larger version

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    In second state after the regression result, I found the following result and got blank value. Can anyone help me how can I solve the problem.
    Click image for larger version

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