Message-ID: <Pine.LNX.4.31.0211250859180.28736-100000@gannet.stats>
Date: 2002-11-25T09:00:38Z
From: Brian Ripley
Subject: Logistic Regression on a Windows Machine
In-Reply-To: <F71IfpT8vWyu9kstC7t000050e1@hotmail.com>
On Sun, 24 Nov 2002, Carrie Beam wrote:
> Hello everybody,
>
> I am hoping you can help me. I just downloaded and installed the
> "precompiled binary distribution" of R to my Windows machine (running
> Windows Millennium). (I did not download or install anything else - no
> packages).
>
> I need to run a logistic regression and understand the function I need is
> polr() or maybe SSlogis().
>
> However, when I try to invoke either function, I get
> Error: couldn't find function "polr"
> Error: couldn't find function "SSlogis"
>
> I have done some snooping on the website and think I may need the MASS
> package for polr() and the NLS package for SSlogis().
>
> My questions:
> 1. Are these indeed the functions I need to run a logistic regression?
Probably not. See ?glm if you mean a binomial logistic regression.
nls/SSlogis will give you a least-squares logistic fit.
> 2. If so, are the packages with them available for a Windows machine?
Yes, just look at the results of library().
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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