[R] regression with proportion data

S Ellison S.Ellison at LGCGroup.com
Mon Mar 19 15:35:01 CET 2012


> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Georgiana May
> Sent: 19 March 2012 14:06
> To: r-help at r-project.org
> Subject: [R] regression with proportion data
> I understand that the binomial function concerns successes 
> vs. failures and can use those raw data, but the R Book and 
> other sources seem to suggest that proportion data are usable 
> as well.  Not so?

You _can_ use a two-column matrix with counts of successes and failures in the two columns

And if you know what the number n of observations was (which you would need to anyway for using proportions in a logistic regression) youcan calculate that matrix from the proportions and n, as long as you're reasonably careful about rounf=ding.

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