+Panelist+rep+Product:Panelist+Product:rep+Panelist:rep", firstvar=4)
我的数据框架包括:第1栏:小组成员,充满了小组成员的名字,第2栏contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2or more levels In addition: Warning messages: 1: In xtfrm.data.fra