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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...