Dear Stata Users,

I want to use "prodest" command to estimate TFP. Can you, please adress the following concerns:

1. I want to follow methodology of Wooldridge (2009). Do I need to specify "gmm" below:

prodest logVA, free(logL) proxy(logInput) state(logK) method(wrdg) gmm i(firm) t(year) ?


2. The command provides residuals (TFP) in levels. Is it possible to get the residuals in real value?