search for: _differences_

...s(contrasts=c("contr.treatment","contr.poly")) model <- lm(y~x+x:z) # coefficient table in summary gives the intercept, first slope and the difference in slopes summary(model) # confint gives the confidence interval for the intercept and first slope, # and the CIs for the _differences_ confint(model) ################# What I'd like to report are the actual CI's for the slopes for the second and third treatments, in the same way that confint returns the parameter estimates for the first treatment. Can anyone point me in the right direction? Thanks, David