[R] summary() after changing contrasts

S Ellison
2012-08-10T13:55:23Z

You might take a look in he car package. if I recall correctly, it includes some
'pretty' versions of contrasts that tidy up the displayed format.

S Ellison

> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Daniel Weitzenfeld
> Sent: 09 August 2012 22:08
> To: r-help at r-project.org
> Subject: [R] summary() after changing contrasts
>
> Hi,
> After running a regression on a factor variable, summary()
> reports the coefficients 'nicely,' ie, labelled with a string
> that is a concatenation of the variable name and the factor label.
> However, changing the base case a la
>
> contrasts(variable)<-contr.treatment(N, base=x)
>
> results in the coefficients being reported as a less-helpful
> concatenation of variable name plus a digit.
>
> Of course, it's possible to map the digit to the appropriate
> factor label, but I'm wondering if there's an easy fix...
> -Dan
>
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