我的程序如下:
tsset gvkey1 fyear
egen group = group(gvkey1 )
sum group
local N=r(max)
forvalues i=1(1)`r(max)'{
rolling _b, window(10) saving(beta): xtmixed `i' lnrev lncap lnlabor lnadv lagrd lagspill || gvkey1: lncap lnlabor lnadv lagrd lagspill,mle
}
为什么stat 显示
1 invalid name
an error occurred when rolling executed xtmixed
r(198);
end of do-file
r(198);
求助大神,万分感谢