Conferences on Statistics in Clinical Trials

2002-02-23 Thread Frank E Harrell Jr
Dear Colleagues Please find attached a copy of all the forthcoming statistical conferences Henry Stewart Conference Studies are organizing in the US and Europe. A reduced rate is offered to all members of academia who wish to attend any of the courses and conferences we organise. If anyone is i

Re: Empirical data Fitting

2002-01-03 Thread Frank E Harrell Jr
Is there a definite need for fitting the distribution? If you have to try many distributions or fit many parameters, the mean squared errors of the resulting distribution estimates are no lower than that of nonparametric estimates (empirical CDF or kernel density estimator). Frank Harrell On We

Re: Analysis of covariance

2001-09-27 Thread Frank E Harrell Jr
> Radford M. Neal [EMAIL PROTECTED] > Dept. of Statistics and Dept. of Computer Science [EMAIL PROTECTED] > University of Toronto http://www.cs.utoronto.ca/~radford > ---

Re: Cross validation procedures

2001-08-22 Thread Frank E Harrell Jr
. The bootstrap is easy to program and can correctly penalize for model uncertainty caused by variable selection (unlike cross-val). Frank Harrell -- Frank E Harrell Jr Prof. of Biostatistics & Statistics Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences U.

Re: Statistics Q

2001-07-23 Thread Frank E Harrell Jr
erage are preserved. Frank Harrell -- Frank E Harrell Jr Prof. of Biostatistics & Statistics Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences U. Virginia School of Medicine http://hesweb1.med.virginia.edu/biostat ===

Education & Voting Tendencies by County

2000-11-25 Thread Frank E Harrell Jr
g a copy of the S-Plus transport-format dataset can get it next Tuesday from hesweb1.med.virginia.edu/biostat/s/data/counties.sdd. -- Frank E Harrell Jr Prof. of Biostatistics & Statistics Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences U. Virginia Schoo

Suggestion for dataset needed

2000-10-25 Thread Frank E Harrell Jr
to another format. -- Frank E Harrell Jr Prof. of Biostatistics & Statistics Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences U. Virginia School of Medicine http://hesweb1.med.virginia.edu/biostat

Advanced/Specialized S-PLUS Courses

2000-08-03 Thread Frank E Harrell Jr
This email will give you details on the following specialized/advanced courses offered by MathSoft, Inc during August 2000 by Dr Frank Harrell: 1) S-PLUS for Statistical Data Analysis 2) Regression Modeling Strategies _

Re: S

2000-07-25 Thread Frank E Harrell Jr
. Does anybody know if there's a newsgroup for this? The > closest name I could find is alt.lang.s-lang, but it seems to be about > something completely unrelated. Thanks. > > Chad Scherrer I have attached information on subscribing to s-news. -- Frank E Harrell Jr

Re: Data Mining blooper and Related Subjects

2000-04-29 Thread Frank E Harrell Jr
ss thoughtful > > people send inappropriate messages. Please DO NOT COMPLAIN TO > > THE POSTMASTER about these messages because the postmaster has no > > way of controlling them, and excessive complaints will result in > > termination of the list. > > > > For inf

Announcement: Mastering Statistical Issues in Drug Development

2000-04-27 Thread Frank E Harrell Jr
Dear Colleagues, MASTERING STATISTICAL ISSUES IN DRUG DEVELOPMENT - ANTICIPATING THE REGULATORS' CHALLENGE 15 & 16 May 2000 WYNDHAM HOTEL, WASHINGTON D.C., USA Professor Stephen Senn (University College London) in association with Henry

Re: Data Mining blooper

2000-04-27 Thread Frank E Harrell Jr
gt; > > > > > > -- > > T.S. Lim > > [EMAIL PROTECTED] > > www.Recursive-Partitioning.com > > > > > > > > ---- > > Get paid to write review! http://recursive-partitioning.epinions.com -- Frank E Harrell Jr Professor of

Re: Data Mining

2000-04-13 Thread Frank E Harrell Jr
"T.S. Lim" wrote: > Data Mining = Statistics reborn with a new name. > > You ask the wrong crowd. Go to > >http://www.kdcentral.com > > and subscribe to datamine-l mailing list. That's debatable. The poster's question has as much to do with regression to the mean as with modeling, and any

Public domain nomenclature

2000-03-24 Thread Frank E Harrell Jr
Tony Rossini has taken the time to explain to me the importance of distinguishing between "freely available", "open source", and "public domain" software. The first two have a similar meaning and are both different from the last. My software is more in the first two categories. I stand corr

Re: Help! Survival curve plot (Kaplan-Meier) with absolute numbers -

2000-03-24 Thread Frank E Harrell Jr
gton (Th) Box 357232 206-543-1044 (3286=fax) > Center for AIDS Research/HMC/UW (M/F) Box 359931 206-731-3647 (3693=fax) > VTN/SCHARP/FHCRC (Tu/W) Box 358080 206-667-7025 (4812=fax) > rossini@(biostat.washington.edu|u.washington.edu|hivnet.fhcrc.org) > http://www.bio

Re: Help! Survival curve plot (Kaplan-Meier) with absolute numbers -

2000-03-23 Thread Frank E Harrell Jr
Sergei A Gutnikov, MD DPhil > Research Associate > University of Oxford > Department of Clinical Neurology > = -- Frank E Harrell Jr Professor of Biostatistics and Statistics Division of Biostatistics and Epidemiology Department of Health Ev

Re: University Question

2000-02-25 Thread Frank E Harrell Jr
to get a MSc in computer science to enter money-making industry... > > -- -- Frank E Harrell Jr Professor of Biostatistics and Statistics Division of Biostatistics and Epidemiology Department of Health Evaluation Sciences University of Virginia School of Medicine http://he

Re: biostatistics

2000-02-24 Thread Frank E Harrell Jr
messages and information about how to > unsubscribe, please see the web page at > http://jse.stat.ncsu.edu/ > ======= -- Frank E Harrell Jr Professor of Biostatistics and Statistics Division of Biostatistics and Epidem

Re: statistical computing

2000-02-22 Thread Frank E Harrell Jr
C. Different universities tend to use different statistical languages/packages, so you may want to find out what is taught at each place. Frank E Harrell Jr Professor of Biostatistics and Statistics Division of Biostatistics and Epidemiology Department of Health Evaluation Sciences University of Vir

Re: Max R-sq for Binary Data

2000-02-07 Thread Frank E Harrell Jr
all zeros and the last 5 would be all ones. At > the center, half the points would be zeroes and the other half would be > ones. > > ** R^2 = (S^2 around mean - S^2 around model) / (S^2 around mean) -- Frank E Harrell Jr Professor of Biostatistics and Statistics Division of Bios

Re: Textbooks for a course in data mining for scientists and engineers

2000-01-26 Thread Frank E Harrell Jr
One very good book is "How to Find Noise in Data" by "I. Ben Fooled". Sorry - I couldn't resist. Frank E Harrell Jr Professor of Biostatistics and Statistics Division of Biostatistics and Epidemiology Department of Health Evaluation Sciences University of Virgini

Re: Prediction Model Question

1999-12-29 Thread Frank E Harrell Jr
confusing; especially with the "quantitative" (non-categorical) > > variables, whose products with other such variables are likely to be > > strongly (positively) correlated with the original variables merely > > because the original variables tend to be always pos

Re: Prediction Model Question

1999-12-21 Thread Frank E Harrell Jr
"Donald F. Burrill" wrote: > Inicidentally, I'd strongly recommend constructing interaction variables > that are orthogonal at least to their own main effects (and lower-order > interactions, when there are any), and possibly orthogonal to some or all > of the apparently irrelevant other predic

Re: Prediction Model Question

1999-12-17 Thread Frank E Harrell Jr
tes (and thus the associated t-tests or > F-tests) may change depending on the coding, but the parameter estimates > are not unique anyway when categorical variables are used. > > -- > Paige Miller > Eastman Kodak Company > [EMAIL PROTECTED] > "It's nothing until I

Re: Disadvantage of Non-parametric vs. Parametric Test

1999-12-08 Thread Frank E Harrell Jr
aring groups or testing correlations. The sample median has efficiency of only 2/pi against the sample mean if the data are from a normal distribution. -- Frank E Harrell Jr Professor of Biostatistics and Statistics Division of Biostatistics and Epidemiology Department of Health Evalua

Re: Data sample and log normal distribution

1999-11-30 Thread Frank E Harrell Jr
"Donald F. Burrill" wrote: > On Fri, 26 Nov 1999, Frank E Harrell Jr wrote: > > > Beware - you can't just anti-log the mean and s.d. The median > > unlogged value is the antilog of the mean of the logged values. > > That's interesting. The an

Re: Data sample and log normal distribution

1999-11-26 Thread Frank E Harrell Jr
urrill [EMAIL PROTECTED] > 348 Hyde Hall, Plymouth State College, [EMAIL PROTECTED] > MSC #29, Plymouth, NH 03264 603-535-2597 > 184 Nashua Road, Bedford, NH 03110 603-471-7128 -- Fra