use hsng2.dta, clear
ivregress gmm rent pcturban (hsngval = faminc reg2-reg4), small
est store gmm
regress rent pcturban hsngval
est store ols
hausman gmm ols
用hausman检验变量是否内生的时候,在stata11中为什么运行会出现问题hausman cannot be used with vce(robust), vce(cluster cvar), or p-weighted data
应当怎么修正呢?