search for: nhorton

# is there a bug in the calculation of the odds ratio in fisher.test? # Nicholas Horton, nhorton at smith.edu Fri Jan 22 08:29:07 EST 2010 x1 = c(rep(0, 244), rep(1, 209)) x2 = c(rep(0, 177), rep(1, 67), rep(0, 169), rep(1, 40)) or1 = sum(x1==1&x2==1)*sum(x1==0&x2==0)/ (sum(x1==1&x2==0)*sum(x1==0&x2==1)) library(epitools) or2 = oddsratio.wald(x1, x2)$measure[2,1] or3 =...

...alEnv, package:foreign, package:stats, package:graphics, package:grDevices, package:utils, package:datasets, package:methods, Autoloads, package:base Nicholas Horton Department of Mathematics and Statistics, Smith College Clark Science Center, Northampton, MA 01063-0001 http://www.math.smith.edu/~nhorton

Is there an R package available that would facilitate doing a power/sample size analysis for linear mixed effects models? I have seen the Java applets made available by Russell Length which would seem to be able to handle most any lme, but there is little documentation and it's not clear how the models need to be formulated. Rick B.

How can I compute a power analysis on a multi-factor within-subjects design?

Un texte encapsul? et encod? dans un jeu de caract?res inconnu a ?t? nettoy?... Nom : non disponible Url : https://stat.ethz.ch/pipermail/r-help/attachments/20070404/0f61f54a/attachment.pl

<<insert bug report here>> The note in the as.Date() documentation is ambiguous (is it referring to February 3rd, 2001, or March 2nd, 2001?) While it is certainly true that one could peruse the ISO 8601 standard to determine which ordering is correct, changing the example day to one where the day value is >12 would resolve the ambiguity. Current Note: The default formats