Displaying 1 result from an estimated 1 matches for "firsttimepoint".
2010 Apr 11
2
simple question about contrasts, lm and factors
...ld I use polynomial contrasts? My timepoints are very far from
being evenly spaced, so ordinary R contrasts seem more natural. But I'm
totally inexperienced (this is my first serious regression).
I also want to choose my base value. In the first call to lm, I want to
choose base value equal to FirstTimePoint.
In my second call to lm, I want to choose base value to be the interaction
term FirstTimePoint:FALSE or FirstTimePoint:0.
Does all this make sense? Please excuse my inexperience if it doesn't. If it
makes sense, then there must be two simple calls to lm. But I'm floundering.
Thanks a lot...