[R] count of factors

Thomas Lumley thomas at biostat.washington.edu
Thu Sep 2 17:51:27 CEST 1999

On Thu, 2 Sep 1999, Laurent Gautier wrote:

> Hello,
> I was used to count how many times every factor is found the following
> way :
> (assuming 'vect' is a vector of factors)
> tapply(vect,vect,length)

You could use table(vect) to count the number of times each level appears
in vect.

Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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