[R] Change properties of line summary in interaction.plot

[David Winsemius]

On Sep 7, 2011, at 3:46 PM, dadrivr wrote:

> Here's an example:
> /id <-  
> c(17,17,17,18,18,18,19,19,19,20,20,20,21,21,21,22,22,22,23,23,23,24,
>        24,24,25,25,25,26,26,26)
> age <- rep(c(30,36,42),10)
> outcome <-
> c(12,17,10,5,5,2,NA,NA,NA,8,6,5,11,13,10,15,11,15,13,NA,9,0,0,0,20,
>             14,16,1,2,2)
> mydata <- as.data.frame(cbind(id,age,outcome))
> interaction.plot(mydata$age, mydata$id, mydata$outcome, fun = mean,  
> legend =
> FALSE, lty = 1, xtick = TRUE, type = "l")/
>
> How can I make the 'mean' summary line red and thicker?

What "mean summary line"? I count 8 lines and that matches the number  
if id's with complete data.


>
> Thanks!
>
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David Winsemius, MD
West Hartford, CT