31个省的面板数据,总样本回归时结果良好
现在分地区回归时,出现以下这种错误提示,是什么意思?
求大佬解答!!!很急
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.


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