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nonsignificant
2008 Apr 17
0
linear contrasts in coxph?
...o calculate linear contrasts with coxph via the contrasts
function, but I'm not sure if it is correct.
First, all the statistics change, if I state 2 contrasts instead of 3.
Second, stipulating common linear contrasts does not even nearly produce an
expected result (i.e. -1,1,0,0 should lead to nonsignificatn result, as
group A and B are not differing very much)
So, I suppose a contrast like -1,0,0,1 isn't just first versus last group,
but I didn't found anything on that yet.
Do you have an idea?
Kind reagrds,
John
Code:
x <- 40
weeka <- round(rnorm (x,4,0.3),0)
weekb <- round(rnorm (x...