运行模型出现错误variance-covariance matrix of the two-step estimatoris not full rank
Two-step estimator is not available. One-step estimator is available and variance-covariance matrix
provides correct coverage.
GMM模型命令是这样 xtabond lwage occ south smsa ind,lags(2) maxldep(3) twostep vce(robust)


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