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overlay plot question

3 messages · David Kaplan, David Freedman, Doran, Harold

David Kaplan
# 
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 Freedman
# 
You could change the second 'plot' to 'points'

David Freedman
David Kaplan-2 wrote:

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Doran, Harold
    

    

      
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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"))