Dear all,
I was trying to apply system GMM on the panel dataset counting firms over the 2006-2014 period. However my interest lies in 2008-2014 period. Hence, I apply the following command
Afterwords, just out of curiosity, i dropped 2006 and 2007 year and then applied the command with slightly different syntax, expecting the same results
however, the results differ!
Does anyone know why?
I was trying to apply system GMM on the panel dataset counting firms over the 2006-2014 period. However my interest lies in 2008-2014 period. Hence, I apply the following command
Code:
xtabond2 y L.Y x y z i.year if ser==0 & year>2008, /* */ robust twostep cluster(id) small /* */ gmm(L.Y, coll lag(1 2)) /* */ iv(x y z yr2-yr7)
Code:
xtabond2 y L.Y x y z i.year if ser==0, /* */ robust twostep cluster(id) small /* */ gmm(L.Y, coll lag(1 2)) /* */ iv(x y z yr2-yr7)
Does anyone know why?
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