[R] summary of categorical variables

[John Kane]

Will not just apply(mydf, 2 table) 
give you what you want in a list format?


--- darteta001 at ikasle.ehu.es wrote:

> 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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