您好,我想请教一下,我的δLev和DEV(资本结构偏离)回归的系数是显著负相关,目标资本结构用的是GMM和LSDVC估计的。有人有同样的问题嘛?是哪里出问题了呢?
xtset Stkcd Year
gen δLEV=Lev-F.Lev
gen AbsDev_LSDVC1=abs(LSDVC-F.Lev)
gen AbsDev_GMM1=abs(GMM-F.Lev)
center AbsDev_LSDVC1 Epu1
gen interact1=AbsDev_LSDVC1*Epu1
xtset Stkcd Year
global firmcontrol_1" Size Profit Tang Tobinq Dep Industry1 Median"
xtreg δLEV AbsDev_LSDVC1 interact1 Epu1 i.Year i.Industry1 $firmcontrol_1,r
estimates store m1
这个是命令