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...-missing arguments to max; returning -Inf Does anyone know how to solve this problem? As I suppose that the problem has something to do with the way I coded the variables, here is how i did it: voxit$leaflet[voxit$a65== "Ja"] <- 1 voxit$leaflet[voxit$a65== "Nein"] <- 0 voxitf <- subset(voxit, leaflet >= 0 ) voxitf$partisan[voxitf$a87x== "1 Tag oder weniger vorher"] <- 0 voxitf$partisan[voxitf$a87x== "Einige Tage vorher"] <- 1 voxitf$partisan[voxitf$a87x== "1-2 Woche(n) vorher"] <- 2 voxitf$partisan[voxitf$a87x== "Mehre...