有大佬可以帮忙看一下这个错误是什么意思吗？这个要怎么解决呢？
> Y <- auto$gtfp> D <- auto$dt > M <- auto$btci_dl> X_vars <- c("roa","roe","sa_index","tobin","roa2","roe2","sa_index2","tobin2","id","year","行业代码")> X <- as.matrix(auto[, X_vars])> set.seed(1234) > output1 <- medDML(y = Y, d = D, m = M, x = X, k = 5, order = 1, multmed = TRUE, fewsplits = FALSE, normalized = TRUE)
错误于lognet(xd, is.sparse, ix, jx, y, weights, offset, alpha, nobs, :   one multinomial or binomial class has 1 or 0 observations; not allowed
用到双重机器学习模型做因果中介检验