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st: dropped varaibles when using TwoStep GMM

From   ahmed al-darwish <>
Subject   st: dropped varaibles when using TwoStep GMM
Date   Wed, 27 Feb 2008 16:00:55 -0800 (PST)

Dear statalisters;
Can anyone tell me why I get some of my RHS variables
dropped when adding the two-step option to either
xtabond or xtabond2?! 

Here is the command I'm using: 

xtabond2 Y x1 x2  year1990 year2001, two iv(year1990
year2001) gmm(x1 x2) robust

? x1 dropped

My panel(10-firmsx17-years)

any comments please


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