>>>>> "Spencer" == Spencer Graves <[EMAIL PROTECTED]> >>>>> on Mon, 12 Jul 2004 10:44:25 -0700 writes:
Spencer> Please see: Brown, Cai and DasGupta (2001) Spencer> Statistical Science, 16: 101-133 and (2002) Annals Spencer> of Statistics, 30: 160-2001 Spencer> They show that the actual coverage Spencer> probability of the standard approximate confidence Spencer> intervals for a binomial proportion are quite poor, Spencer> while the standard asymptotic theory applied to Spencer> logits produces rather better answers. Spencer> I would expect "confint.glm" in library(MASS) Spencer> to give decent results, possibly the best available Spencer> without a very careful study of this particular Spencer> question. Consider the following: Spencer> library(MASS)# needed for confint.glm Spencer> library(boot)# needed for inv.logit ^^^^^^^^^^^^^^^^^^^^ Spencer> <.............> well, did you ever look at the definition of inv.logit() ? doing it for you: inv.logit <- function(x) plogis(x) hence I'd think "boot" is not really needed. And, BTW, consequently the logit() function in the 'boot' package is the same as qlogis() [and could well be defined that way instead of slightly more complicated]. I'll add a \concept{logit} to the plogis / qlogis help page and a \note{} telling this to those who forget.. Martin Maechler, ETH Zurich ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html