[R] Making a data frame into a factor ?

Charilaos Skiadas cskiadas at gmail.com
Wed Apr 16 04:41:43 CEST 2008

I think you want to look into ?stack. For example:

y<- stack(x)

Then x$values are the values, and x$ind is the factor.

On Apr 15, 2008, at 9:36 PM, Paul Lynch wrote:

> Hi,
>    I'm trying to do a linear regression style one-way ANOVA using some
> data in a data frame, and (perhaps because I am still relatively
> unfamiliar with both R and statistics) what I thought I should do was
> to make the data frame into a factor.  By that I mean that I have a
> data frame whose column labels are the levels of the factor, and the
> values in the frame are numeric values for the dependent variable.
>    I can construct the relevant vectors by hand, if I have to (and I
> guess I will start in that direction) but I am sure there must be 1-3
> line bit of R that could elegantly create the factor and the vector of
> values.
>    Thanks in advance,
> -- 
> Paul Lynch
> Aquilent, Inc.
> National Library of Medicine (Contractor)

Haris Skiadas
Department of Mathematics and Computer Science
Hanover College

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