Martin, thank you very much for the reply, I ran the following code you provided:
webuse nlswork, clear
generate age2 = age^2
generate ttl_exp2 = ttl_exp^2
generate tenure2 = tenure^2
generate byte black = race==2
xtset idcode
xtreg ln_w grade age* ttl_exp* tenure* not_smsa south if black, re
estimates store first
xtreg ln_w grade age* ttl_exp* tenure* not_smsa south if !black, re
estimates store second
suest first second
I get the following error code:
first was estimated with a non-standard vce (conventional)
r(322);
Any additional suggestions?
Thank you very much,
Joshua A. Shindell
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