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# Replicate parts of Table 4 in Arellano and Bond,
# "Some Tests of Specification for Panel Data: Monte Carlo 
# Evidence and an Application to Employment Equations",
# Review of Economic Studies, 58 (1991), pp. 277-297.

open abdata.gdt

# We first treat all the independent variables as
# exogenous (Table 4, column b)

list X = w w(-1) k ys ys(-1)

# 1-step GMM estimation
dpanel 2 ; n X const --time-dummies --asy --dpdstyle
# 2-step estimation
dpanel 2 ; n X const --time-dummies --asy --two-step --dpdstyle

# Then we treat the wage and capital stock as predetermined,
# not exogenous.  This gives an approximation to Table 4,
# column c.  But note that some of the data used in that
# model are not available.  In addition, we're using
# finite-sample corrected standard errors.

list Ivars = ys ys(-1)
dpanel 2 ; n X const ; GMM(w,2,3) GMM(k,2,3) Ivars --time --dpd
dpanel 2 ; n X const ; GMM(w,2,3) GMM(k,2,3) Ivars --time --two-step --dpd