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
Ahmed
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