All,
I have been reading Dr. Harrell's excellent
"Regression Modeling Strategies" book and trying out
the exercises. I understand that contrast( ) is used
to obtain contrasts between two variables for given
levels of other nuisance variables; is there a way
to use contrast( ) to obtain, for example, Scheffe
confidence intervals / hypothesis tests for many
post hoc contrasts at once?
Any help would be much appreciated,
Greg
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