Hi Gabor,
in your example X is not a factor, I don't know if this matters.
> x <- head(letters)
> is.factor(x)
[1] FALSE
Here is an example of my problem:
The file C://test.txt contains
id|bmicat|cat
1 |NA |.
2 |<23 |a
3 |>28 |b
4 |NA |c
>
test<-read.table("C://test.txt",header=T,sep="|",na.strings=c("NA","."),colClasses=c(id="factor",
bmicat="factor", cat="factor"))
> summary(test)
id bmicat cat 1 :1 <23 :1 a :1 2 :1 >28 :1 b :1 3
:1 NA :2 c :1 4 :1 NA's:1 > levels(test$bmicat)
[1] "<23 " ">28 " "NA "
> levels(test$cat)
[1] "a" "b" "c"
>
I tried the to read this file with out the cat variable and read.table()
recognized the "NA" properly. Adding the cat variable and its other code
for the missing (".") seems to confuse read.table().
Thanks for your help.
Peter
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