请问模型中有一个变量为Xit，如何表示和处理呢？

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如图，请问模型中的[size=8.83019pt]λ[size=5.14286pt]8 [size=8.83019pt]X[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t的Xit在reg的时候如何表示？Xit是指解释变量和别解释变量以外的控制变量吗？求教！！！！
目前我的是：global x1 "Down*ESOP*lnPerf Down*lnPerf lnPerf Down*ESOP ESOP Down"
reg Xit $x1,vce(cluster stkcd)

将高管－员工薪酬粘性差距模型
设定如下:
[size=8.83019pt]gap=[size=8.83019pt]λ[size=5.14286pt]0[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]1[size=8.83019pt]D[size=8.83019pt]o[size=8.83019pt]wn[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]×[size=8.83019pt]ESOP[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]×ln[size=8.83019pt]Perf[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]2[size=8.83019pt]ESOP[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]×ln[size=8.83019pt]Perf[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]3[size=8.83019pt]Down[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]×ln[size=8.83019pt]Perf[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]4 [size=8.83019pt]ln[size=8.83019pt]Perf[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]5[size=8.83019pt]Down[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]×[size=8.83019pt]ESOP[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]6[size=8.83019pt]ESOP[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]7[size=8.83019pt]Down[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]λ[size=5.14286pt]8 [size=8.83019pt]X[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]+[size=8.83019pt]δ[size=5.14286pt]i[size=5.14286pt]，t

([size=8.83019pt]其中，[size=8.83019pt]X[size=5.14286pt]i[size=5.14286pt]，[size=5.14286pt]t[size=8.83019pt]代表模型中一系列的控制变量

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关键词：Xit Cluster Global lobal stkcd