error message in -plausexog-

[Parul Gupta]

I am running -plausexog- (ssc install) but I am getting an error message.

ivreg2 z y1 y2 (x=IV1 IV2)

plausexog uci z y1 y2 (x = IV1 IV2), xomega(IV1 IV2) gmin(0.05 0.05) gmax(0.07 0.07)

You must define as many gamma values as instrumental variables
If instruments are believed to be valid, specify gamma=0 for gmin and gmax
r(200);

Please tell me where am I going wrong? I am specifying two values in gmin and gmax.

[Parul Gupta]

I figured out the answer myself. I was using a factor variable as an IV: when I removed the factor notation, the error vanished. It seems like the factor variable was being considered as "two" variables, hence Stata asked for more gamma parameters to be specified.