jlaake wrote:\\
As you know, no matter what DM you use, you can always construct a linear contrast for whatever comparison (interaction) you may want.
Indeed, but the construction can be laborious, and non-intuitive.
- Code: Select all
lc=cbind(c(0,1,-1,rep(0,6)),c(0,0,0,1,-1,rep(0,4)),c(rep(0,4),0,1,-1,rep(0,2)),c(rep(0,6),0,1,-1))
And the preceding is more transparent/easier to follow than (say) a DM? Riiiiight....replace a bunch of 1's and 0's with bits of R gibberish. Yup, clear as day.
[Actually, with even my rudimentary R skills, it is somewhat 'readable'. But, I'd submit it is no less error prone in the construction phase than a DM.....]
Hey I got a t-shirt the other day that you'll love. It says
I can explain it to you
but I can't understand it for you!
Great -- I'll have to hunt one down.