Hello R users,
I run this code under windows XP and R 2.7.1 :
> head(esoph)
agegp alcgp tobgp ncases ncontrols
1 25-34 0-39g/day 0-9g/day 0 40
2 25-34 0-39g/day 10-19 0 10
3 25-34 0-39g/day 20-29 0 6
4 25-34 0-39g/day 30+ 0 5
5 25-34 40-79 0-9g/day 0 27
6 25-34 40-79 10-19 0 7
> class(esoph$agegp)
[1] "ordered" "factor"
> class(esoph$alcgp)
[1] "ordered" "factor"
> class(esoph$tobgp)
[1] "ordered" "factor"
> class(esoph$ncases)
[1] "numeric"
> class(esoph$ncontrols)
[1] "numeric"
> apply(esoph, 2, class)
agegp alcgp tobgp ncases ncontrols
"character" "character" "character" "character" "character"
I don't understand why the result is all "character"...
Thanks a lot.
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