search for: 96h

I am attempting to estimate LC50 (analogous to LD50, but uses exposure concentration rather than dose) by fitting a Weibull model; but I can't seem to get it to work. From what I can gather, I should be using survreg() from the survival package. The survreg() function relies on time-to-event data; my data result from 96 h exposures (i.e., dead or alive after a fixed period; 96 h). I've

I've been checking the updates tree for 5.4 and notice that they're empty. I checked 4 or 5 different servers and got the same results. This is, in my experience, unusual; there's typically patches for the new release from day one. But it could be that the 5.4 DVD is up to date. So I checked one of my machines and what updates it would need against 5.3 vs those that it would need to