Message-ID: <4188FA35.5080801@pdf.com>
Date: 2004-11-03T15:33:09Z
From: Sundar Dorai-Raj
Subject: Newbie question: plotting regression models
In-Reply-To: <D599F609-2DAA-11D9-9761-000A9591E11C@musc.edu>
adelmaas at MUSC.EDU wrote:
> Greetings.
>
> Is there any way to get R to take a regression model object and draw a
> plot of the regression function? How about overlaying that plot over a
> scatterplot of the actual data? Thanks in advance for any help anyone
> can provide.
>
> Aaron
>
Hi Aaron,
What type of "regression function" are your referring to? Linear model?
Non-linear model? The term "regression" is to ambiguous to really answer
your question. However, typically you should be able to do something like:
fit <- lm(y ~ x)
yhat <- predict(fit)
plot(x, y, ylim = range(c(y, yhat)))
lines(x, yhat)
If you are not using lm please provide more information than you already
have. You should read "Introduction to R" or any of the recommended
texts listed on the R website. Also read the posting guide.
--sundar