heckman exportsale 学历 klratio bcredit age size lev rp i.year i.ind,select(学历 klratio bcredit age size lev rp i.year i.ind)twostep
note: two-step estimate of rho = 1.2026029 is being truncated to 1
ind: factor variable base category conflict
ind是行业代码,factor variable base category conflict这个错误什么意思?求教大神


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