frequency

I'm quite new with R so sorry if I asked something very easy or complicated.
I have a data frame with (for instance) 4 variables (4 columns) and 100 records. I would like to have a 'summary' table for each variable that shows me the following:

variable 1      Freq.    %     % cumulative

class 1           10        10%      10%
class 2           20        20%      30%
class 3           70        70%     100%

Assume you data.frame is called DAT. With

  lapply(DAT, table)

you can apply the function table() on each variable of the data.frame.

Uwe Ligges
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