On Tue, Aug 18, 2009 at 8:13 AM, Frank E Harrell Jr<f.harr...@vanderbilt.edu> wrote: > Noah Silverman wrote: >> >> Hi, >> >> I'm developing an experiment with logistic regression. >> >> I've come across the lrm function in the Design library. >> >> While I understand and can use the basic functionality, there are a ton of >> options that go beyond my knowledge. >> >> I've carefully read the help page for lrm, but don't understand many of >> the arguments and optional return values. >> (penalty, penalty.matrix, strata.penalty, var.penalty, weights) >> >> Additionally, there are several items returned in the model that I don't >> understand. >> (Max Derriv, Model L.R, C, Dxy, Gamma, Tau-a, R2, Briar, Wald Z) >> >> 1) Could someone point me to an online resource where I could learn more? >> (I'm big on trying to teach myself.) >> >> 2) Or, alternately, does anybody want to explain a few things for me? >> >> Thanks! >> >> -- >> Noah > > My book Regression Modeling Strategies covers much of that. Its case study > on penalized ordinal logistic regression is also largely in a paper in > Statistics in Medicine if you have access to that. Once you do some > background reading I'll be glad to answer some focused questions. > Frank > > -- > Frank E Harrell Jr Professor and Chair School of Medicine > Department of Biostatistics Vanderbilt University >
Noah, I have found the Regression Modeling Strategies book to be incredibly valuable. I also took a Regression course with Frank Harrell this past February (http://biostat.mc.vanderbilt.edu/wiki/Main/RmS#2009_Upcoming_short_courses_in_R). I can not say enough about this course. I am an ecologist but had no problem with the mostly medical examples. Dr. Harrell is a great teacher! There was so much great information presented that I hope to repeat the course if at all possible! Good luck, Michael -- Michael Denslow Graduate Student I.W. Carpenter Jr. Herbarium [BOON] Department of Biology Appalachian State University Boone, North Carolina U.S.A. -- AND -- Communications Manager Southeast Regional Network of Expertise and Collections sernec.org ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
