Hello,
I'm trying to do a probit plot but am a little confused about how to do this.
Sample data:
> dat <-
data.frame(dose=c(0.18,0.48,0.78,0.18,0.48,0.78),n=c(103,120,123,60,110,100),r=c(19,53,83,14,54,81),
+ sample=c("s","s","s","t","t","t"))
Does anyone know how to plot the probit of the response vs. log(dose) with the 2
regression lines for the two treatment groups
superimposed onto one graph?
Any comments will be much appreciated,
Anne
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