Re: [R] Any package to produce QQplot for survival model checking?

Hi, Steve! Thanks for reply! Acutally, that's what I thought too. But I believe some special control terms are needed. Do you know how could I find some examples? Thanks again. Popo 2009/7/16 Steve Lianoglou > Hi, > > > On Jul 16, 2009, at 2:03 PM, popo UBC wrote: >

[R] Any package to produce QQplot for survival model checking?

Hi there! S provide some functions, such as "qq.weibull", to produce various qqplot for model checking. But I can't find the corresponding version in R. Does any R package available to produce these qqplots? Many thanks in advance!! Cheers~~~ Popo [[alternative HTML version del

[R] A problem about "nlminb"

Hello everyone! When I use "nlminb" to minimize a function with a variable of almost 200,000 dimension, I got the following error. > nlminb(start=start0, msLE2, control = list(x.tol = .001)) Error in vector("double", length) : vector size specified is too large I had the following setting option

Re: [R] About the efficiency of R optimization function

spent too much time? - Mainly, I need to calculate the MLE. But I really have no idea what the likelihood may looks like. According to your experiences, would the likelihood function be too complicated? Is L-BFGS-B good enough? Thanks again!! Popo 2009/5/14 cls59 > > > popo

[R] About the efficiency of R optimization function

Hi all! The objective function I want to minimize contains about 10 to 20 variables, maybe more in the future. I never solved such problems in R, so I had no idea about the efficiency of R's optimization functions. I know doing loop in R is quite slow, so I am not sure whether this shortage influe