Hello,
I am estimating my regression using system GMM.
xtabond2 y L.y x1 x2 x3 yr2004-yr2011 z, gmm(y, lag(2 .) ) iv(x3 yr2004-yr2011, eq(lev)) iv(x1 x2 z) two ar(4) ort nodiff noconst rob
I am concerning most below:
- instrument number to make sure not to exceed group number
-...