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在 R 中使用 ctree 时遇到问题，有时它根本不显示任何级别，下面是一个示例。

谁能解释为什么。谢谢

library("party")

df <- data.frame(matrix(ncol = 3, nrow = 0))
    colnames(df) <- c("a", "b", "c")

    df[nrow(df) + 1,] = c("Y","M","N")
    df[nrow(df) + 1,] = c("Y","F","N")
    df[nrow(df) + 1,] = c("Y","M","Y")
    df[nrow(df) + 1,] = c("Y","F","N")
    df[nrow(df) + 1,] = c("N","F","Y")
    df[nrow(df) + 1,] = c("N","M","N")
    df[nrow(df) + 1,] = c("N","M","Y")
    df[nrow(df) + 1,] = c("N","M","N")
    df[nrow(df) + 1,] = c("N","F","N")
    df[nrow(df) + 1,] = c("N","F","N")

    df$a <- as.factor(df$a)
    df$b <- as.factor(df$b)
    df$c <- as.factor(df$c)

    TMDT<-ctree(a ~ b + c,data=df)
    plot(TMDT,type="simple")
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