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st: gmm and a panel data set

From   "Marder, Andrew" <>
To   "" <>
Subject   st: gmm and a panel data set
Date   Thu, 23 Feb 2012 17:07:53 -0500

Dear Statalist,

I am having some difficulty using the gmm command.  When I use the command as follows:

gmm (`moment_condition'), winitial(identity) instruments(L.(`instruments'))

The command is able to return some estimates.  I am unsure how valid these estimates are because when I run the command treating my data as a panel:

xtset firm_id year
gmm (`moment_condition'), winitial(xt L) xtinstruments(`instruments', lags(1))

I get the following error:

warning: 20398 missing values returned for equation 1 at initial values
             gmm_xtZ_i():  3301  subscript invalid
           gmm_ABond_W():     -  function returned error
              _gmm_wrk():     -  function returned error
                 <istmt>:     -  function returned error

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