On 2012-03-19 07:35, S Ellison wrote:
-----Original Message-----
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Georgiana May
Sent: 19 March 2012 14:06
To: r-help@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.
Yes, and you can also use the proportions directly; just specify
the corresponding vector of number of trials as the 'weights'
argument in the glm() call. See the Details section of ?glm.
Peter Ehlers
S Ellison*******************************************************************
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