> with(df.2, duncan.test(y, A:B, DFerror = 14, MSerror =2.17,console=T))
Error in A:B : NA/NaN参数
此外: Warning messages:
1: In A:B : numerical expression has 24 elements: only the first used
2: In A:B : numerical expression has 24 elements: only the first used
3: In data.frame(y, trt) : 强制改变过程中产生了NA
4: In data.frame(y, trt) : 强制改变过程中产生了NA

按博主的操作，最后出现这样提示，是为什么呢？求指教