[R] overlay plot question

[Doran, Harold]

Did you want something like this:

library(lattice)
x <- plogis(.x, location=0, scale=1)
y <-  plogis(.x, location=2, scale=4)
xvals <- seq(-7.6, 7.6, length=100)
xyplot(x+y ~ xvals,  type = c("g", "l")) 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of David Kaplan
> Sent: Wednesday, February 04, 2009 5:25 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] overlay plot question
> 
> Greetings all,
> 
> I have two logistic plots coming from two calls to plogis.  
> The code is
> 
> .x <- seq(-7.6, 7.6, length=100)
>   plot(.x, plogis(.x, location=0, scale=1), xlab="x", 
> ylab="Density",  main="Logistic Distribution: location = 0, 
> scale = 1", type="l")
>   abline(h=0, col="gray")
>  
> 
> .y <- seq(-7.6, 7.6, length=100)
>   plot(.x, plogis(.x, location=2, scale=4), xlab="x", ylab="Density",
>   main="Logistic Distribution: location = 2, scale = 4", 
> type="l")  abline(h=0, col="gray")
>  
>  remove(.x)
> 
>  remove(.y)
> 
> 
> I would like to overlay these on one plot.  Notice here the 
> y-axis is different.  But I would like to axis to be 0 to 1 
> as in the first plot.
> 
> Any suggestions would be greatly appreciated.
> 
> Thanks in advance,
> 
> David
> 
> 
> --
> ==============================================================
> =========
> David Kaplan, Ph.D.
> Professor
> Department of Educational Psychology
> University of Wisconsin - Madison
> Educational Sciences, Room, 1061
> 1025 W. Johnson Street
> Madison, WI 53706
> 
> email: dkaplan at education.wisc.edu
> homepage:
> http://www.education.wisc.edu/edpsych/default.aspx?content=kaplan.html
> Phone: 608-262-0836
> 
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