[R] Change color of plot points based on values of a variable

[Josip Dasovic]

Thank you, Dieter:

I apologize to all of those who tried to help and who couldn't get my code to work.
I now know three things: 1) stop working at midnight; 2) always provide the correct package
name (I meant arm(), not car(); and 3) when testing code make sure you do it in a new R window.

Dieter has kindly provided a clean version of my code below with a resolution to my plotting
requirements.

Thank you,
Josip

----- Original Message -----
From: "Dieter Menne" <dieter.menne at menne-biomed.de>
To: r-help at stat.math.ethz.ch
Sent: Wednesday, October 1, 2008 3:09:25 AM GMT -08:00 US/Canada Pacific
Subject: Re: [R] Change color of plot points based on values of a variable

Josip Dasovic <jjd9 <at> sfu.ca> writes:

> I have run a logistic regression, used Gelman et al.'s car package to 
>> simulate the parameter estimates of

"car" is by John Fox. You meant "arm".

> I would like the points from 1-24, and 976-1000 to
be one color (the default color is
> fine), and the points 25-975 to be a different color.

Please check your code in a fresh window before you submit it. There were 
7 errors in your code that I almost gave up, and I am sure other people had 
the same problem.

Dieter

library(arm)
set.seed(23)
y<-rbinom(100,1,0.1)
x<-rnorm(100)
fit.1<-glm(y~x, family=binomial(link="logit"))
sim.fit.1<-sim(fit.1, 1000)  
plotdt =sort(invlogit(sim.fit.1$beta[,1]+sim.fit.1$beta[,2]*mean(x)))
col = rep("black",length(plotdt))
col[1:24] = "red"
plot(plotdt,col=col)

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