Saptarshi Guha wrote:
Hello,
I have the following data frame, using lattice and qqmath, how do I display the
quantile plot (e.g distribution = qunif), but highlight the f==TRUE and f==FALSE
differently?

library(lattice)
pp <- function(n) ((1:n)-0.5)/n

x=data.frame(x=runif(20),f=sapply(runif(20),function(r) r>0.5))

I would like a single curve, the following example displays two curves.

qqmath(~x,groups=f,data=x,distribution=qunif,f.value=pp)


Here's one way:

qqmath(~x, data=x, type='b',
  col=ifelse(x$f, 2, 4),
  pch=ifelse(x$f, 17, 19),cex=2)

 -Peter Ehlers



Thank you
Saptarshi

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--
Peter Ehlers
University of Calgary

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