[R] summary of categorical variables
darteta001 at ikasle.ehu.es
darteta001 at ikasle.ehu.es
Mon Jan 21 14:08:04 CET 2008
Dear list,
I have a data.frame with nine categorical variables (0,1,2 and NAs)
that I would like to get the number of events for each of them. I can
extract this using summary() for each variable at a time with the
as.factor()argument (otherwise it will get me the mean value):
>summary(as.factor(mydf[,3]))
0 1 2 NA's
194 67 4 2
Trying to use apply() to get this for all the columns of the
data.frame I cannot use as.factor because it works with vectors and
not data.frames.
Can anyone help me? Maybe a for loop would be good in this case
instead, although I learnt that for loops are not recommended?
Thanks in advance,
David
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