Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Thu, 08 Dec 2005 15:00:38 -0600
Thanks, Nicky Don't draw the curve, which can lead people to select arbitrary cutpoints on the predicted probabilties and to use an improper loss (utility) function. But the area under the ROC curve
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Fri, 09 Dec 2005 10:57:45 -0500
I'll try to be as helpful as I can here and not confuse what is a relatively simple request on your part: I am not an S-Plus user but am aware of the many similarities between this and R. I do not pr
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Tue, 13 Sep 2005 11:40:07 -0500
I am looking for an Splus or R doc / manual for SAS user. Thank you in advance. PK Somewhat helpful in that regard: http://biostat.mc.vanderbilt.edu/twiki/pub/Main/RS/sintro.pdf -- Frank E Harrell Jr
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Thu, 07 Jul 2005 12:09:38 -0500
I thought you might be interested in this tip I wrote for SAS. It is one of many useful techniques in my latest book, Sharpening Your SAS Skills, (www.crcpress.com). SAS Programming Tip from SAS Cert
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Thu, 07 Jul 2005 12:43:23 -0500
Best, Janusz. This is based on a scientific formal analysis: I used SAS for 22 years and have used S-Plus/R for 14 years, looked at the quality of analyses done by SAS users, S-Plus/R users, and myse
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Mon, 11 Jul 2005 12:37:36 -0500
Hello, I am using currently the evrsion 6.1 of Splus. Does anyone know if there is a way to call R functions from Splus (interface...?). The function I Not in general want to use (download.file) is n
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Tue, 12 Jul 2005 10:49:21 -0500
These are very serious problems. I did not realize the licensing changes for S-Plus 7. -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Tue, 12 Jul 2005 10:51:08 -0500
Karin wrote: Hello, I want to make bubbleplots in stead of an ordinary scattor plot in a panel plot. Does anyone know how to do this? What kind of panelfunction do I have to take? Thanks in advance,
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Fri, 01 Apr 2005 07:01:03 -0600
I wish to perform brain surgery this afternoon at 4pm and don't know where to start. My background is the history of great statistician sports legends but I am willing to learn. I know there are cour
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Wed, 23 Mar 2005 06:07:39 -0600
Dear List Members: I need to call a function (namely RCS) from the Design library (SP 2000), but this library seems to have troubles with GLM function. I don't know about obsolete versions, but in l
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Tue, 08 Feb 2005 08:53:08 -0600
The Clinical Data Standards Interchange Committee (CDISC, www.cdisc.org ) has recently developed the Study Data Tabulation Model (SDTM) for data from pharmaceutical clinical trials. These tabulations
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Thu, 24 Feb 2005 08:53:29 -0500
Hi all, Just wondering if anyone can help a beginner - having trouble getting an R squared output from logistic regression in splus 6.2 student version. I get Deviance Residuals, Min 1Q Median 3Q Max
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Thu, 24 Feb 2005 09:28:09 -0500
But is occasionally still useful: @ARTICLE{cox92, author = {Cox, D. R. and Wermuth, N.}, year = 1992, title = {A comment on the coefficient of determination for binary responses}, journal = {The Amer
Author: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
Date: Sun, 02 Jan 2005 20:54:55 -0500
Thanks for any help. David Parkhurst One of several ways: library(Hmisc,T);library(Design,T) dd <- datadist(mydataframe); options(datadist='dd') f <- lrm(death ~ pol(age,2) + sex) # quadratic in age