我想基于因子列添加一列均值R data.frame.像这样:
df1 <- data.frame(X = rep(x = LETTERS[1:2], each = 3), Y = 1:6)
df2 <- aggregate(data = df1, Y ~ X, FUN = mean)
df3 <- merge(x = df1, y = df2, by = "X", suffixes = c(".Old",".New"))
df3
# X Y.Old Y.New
# 1 A 1 2
# 2 A 2 2
# 3 A 3 2
# 4 B 4 5
# 5 B 5 5
# 6 B 6 5
要完成这个问题,我要创建两个不必要的data.frames.我想知道一种方法,可以通过因子列将一列方法附加到我的原始列中 …