. set trace on 
. set tracedepth 1 
to see where the problem is occurring. 
Also, liaise with the program author, evidently not
a member of Statalist. 
Nick 
[email protected] 
Sun, Yan
 
> Thank you for your email. Here it is the command I am using: 
> 
> cdsimeq (lnR4rain simpson landdif ProdPblm AgExt) 
> (D_off_female simpson
> dependc)
 
>          NOW THE SECOND STAGE REGRESSIONS WITH CORRECTED 
> STANDARD ERRORS
> 
> 
> F ambiguous abbreviation
> r(111);
> 
> end of do-file
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