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...VMware Windows guest OS.. I recently bit the bullet and upgraded it from XP SP1 to SP2, and that seemed to work fine for quite a few days. The two major changes I made to the system recently were: 1) The most recent update from CentOS (can't remember which one, but it was within the last two weekd for 5.0). 2) Adding another VM guest OS, this one a CentOS 5.0 guest. What happens is, usually when I click the mouse in the Windows window, the system hangs up completely for some period of time that usually exceeds four minutes. Thereafter, once the VM is "running," it will occasiona...

...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,4,0.4),0) weekc <- round(rnorm (x,8,0.6),0) weekd <- round(rnorm (x,12,0.9),0) week <- c(weeka, weekb,weekc, weekd) cens <- round(runif((4*x),0.4,1),0) # 0 = censored treat <- as.factor(c(rep("A",x),rep("B",x), rep("C",x), rep("D",x))) S <- Surv(week,cens) contrasts(treat, how.many=3) <...