I am working on effect of leverage on firm performance. I have 1220 firms data for 17 years, i am using xtabond2 two-step first difference-GMM Arellano and Bond methodology. Profitability is dependent variable, I am using lag of dependent variable as explanatory variable, leverage is endogenous variable, other control variables I am using salegrowth, tangibility, size and selling and distribution expenses. As leverage is endogenous variable so i am thing of using lag of leverage. so please tell me that is my following equation is correct or not:

please suggest me alternative or more appropriate equation if it there

**xtabond2 profitability L.profitability L.Leverage size salegrowth tangibility S&Dexp yr2000-yr2016, gmmstyle(L.profitability L.Leverage) ivstyle(size salegrowth tangibility S&Dexp yr2000-yr2016) noleveleq robust twostep h(2)**please suggest me alternative or more appropriate equation if it there

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