[R] Ordinal categorical data with GLM

John Fox jfox at mcmaster.ca
Tue Oct 8 14:42:50 CEST 2002

Dear Kenneth,

At 05:50 AM 10/8/2002 -0500, Kenneth Cabrera wrote:

>Is there an easy way (one line command, or at least without "for") to make a
>categorization of a continuos variable that I have in a vector, say "x", 
>and the
>limits of the categories in other vector, say "y". The vector "x" is 10000 
>and the "y" vector is 101 length for 100 categories, where rank of "x" is 
>or at least the same than the rank of "y".

         cut(x, breaks=y)

or, if you want an ordered factor,

         ordered(cut(x, breaks=y))

Be careful to set the first entry of breaks below min(x). See ?cuts for 

I hope that this helps,

John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox

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