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2011 May 29
1
Oddity: I seem to have a variable in a dataframe that doesn't show in colnames() - can anyone advise?
...ught I had a variable AllDat$PHQ and started using it and everything seemed fine until I realised that I shouldn't have it (!) and that the variable I was thinking of is AllDat$PHQ9 and that's there: > colnames(AllDat)[grep("PHQ",colnames(AllDat))] [1] "PHQ9" "HasPHQ" "ZeroPHQ" and, as you can see, AllDat$PHQ. But I can I do: > head(table(AllDat$PHQ)) 0 1 2 3 4 5 731 527 764 845 872 915 Ooops ... so AllDat$PHQ _DOES_ exist. Its contents exactly match AllDat$PHQ9: > table(abs(AllDat$PHQ - AllDat$PHQ9)) 0 19032 I have s...