[R] Frequency and summary statistics table with different variables and categories
dwinsemius at comcast.net
Thu Jan 22 14:32:56 CET 2009
One of the various tabulation functions would seem to be the most
appropriate for getting frequency summaries:
On Jan 22, 2009, at 6:17 AM, Stefan Björk wrote:
> Hello helpers,
> This is probably quite simple, but I'm stuck.
> I want to create a summary statistics table with frequencies and
> statistics for a large number of variables. The problem here is that
> there are two different classes of categories (sex, type of
> substance abuse
> and type of treatent) which overlap, (2) the data for different
> should be presented in different ways -- sometimes with relative
> frequencies, other times with mean values.
> The table would finally look something like:
> All Male Female Alcohol Drug ...
> Age (mean) (mean) ...
> Sex (% male) (freq) (freq) ...
> Alcohol CS (mean) (mean) ...
> ... ...
> Data is in a data frame with quite a lot of columns (variables) and
> each row
> represents a single case.
> I have found out that part of this can be done with tapply, for
> tapply(age, sex, mean) and join it with tapply(age, abuse, mean).
> But how to
> do with frequencies? Or is there an even simpler way?
> [[alternative HTML version deleted]]
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