Actually, I don't really want to do this, but in the interest of
understanding how <xtabond2> and <xtabond> work, suppose I want to
instrument for lagged diff of sex_12 using lagged values of sex_12 &
lagged values of binge_30 but I do not want to instrument for lagged
diff of binge_30. Will (1) get this done? (binge_30 is endog but the
lagged diff of binge_30 does not need to be instrumented for b/c it is
not correlated w/ the error term)
Suppose I want to instrument for only lagged diff of sex_12 using only
lagged values of sex_12. I want to treat lagged diff of binge_30 as
exog. Does (2) do this?
