search for: f1f2

...in the R-help, but without result. See the example : # just to create a dataframe f1 <- factor(rep(c("A","B"),3)) f2 <- factor(rep(c("x","y","z"),each=2)) df <- data.frame(f1,f2) df <- rbind(df,df,df) # here is what I want do do : df$f1f2 <- factor(as.numeric(df$f1)+(as.numeric(df$f2)-1)*nlevels(df$f1), labels= letters[1:(nlevels(df$f1)*nlevels(df$f2))]) # I don't care about the labels. df : > df f1 f2 f1f2 1 A x a 2 B x b 3 A y c 4 B y d 5 A z e 6 B z f 11 A x a 21 B x...

...6, e76, NA Item78 <-> Item78, e78, NA Item79 <-> Item79, e79, NA Item80 <-> Item80, e80, NA Item83 <-> Item83, e83, NA F1 <-> F1, NA, 1 F2 <-> F2, NA, 1 F3 <-> F3, NA, 1 F4 <-> F4, NA, 1 F5 <-> F5, NA, 1 F1 <-> F2, F1F2, NA F1 <-> F3, F1F3, NA F1 <-> F4, F1F4, NA F1 <-> F5, F1F5, NA F2 <-> F3, F2F3, NA F2 <-> F4, F2F4, NA F2 <-> F5, F2F5, NA F3 <-> F4, F3F4, NA F3 <-> F5, F3F5, NA F4 <-> F5, F4F5, NA ###i tryed several correlations, such as hetcor and polycho...

...6, NA reWRONG<->reWRONG, e87, NA reGEAR<->reGEAR, e88, NA reCONSEQ<->reCONSEQ, e89, NA reSUCES<->reSUCES, e90, NA F1<->F1, 1, NA F2<->F2, 1, NA F3<->F3, 1, NA F4<->F4, 1, NA F5<->F5, 1, NA F6<->F6, 1, NA F7<->F7, 1, NA F1<->F2, F1F2, NA F1<->F3, F1F3, NA F1<->F4, F1F4, NA F1<->F5, F1F5, NA F1<->F6, F1F6, NA F1<->F7, F1F7, NA F2<->F3, F2F3, NA F2<->F4, F2F4, NA F2<->F5, F2F5, NA F2<->F6, F2F6, NA F2<->F7, F2F7, NA F3<->F4, F3F4, NA F3<->F5, F3F5, NA F3<-...