Reading value labels to spss file in R

Question

I use this code to read an spss file:

dt<-read.spss("dt.sav",to.data.frame = TRUE,use.value.labels = TRUE)

But I got this error:

Warning message:

In levels<- ( *tmp* , value = if (nl == nL) as.character(labels) else paste0(labels, : duplicated levels in factors are deprecated

I didn't find anything about it. Could anyone help me?

Answer 1

According to the error message, it seems that you have duplicated factors.

You should use:

dt<-read.spss("dt.sav",to.data.frame = TRUE,use.value.labels = TRUE,duplicated.value.labels="append")