Dr. Prechelt:
I have coded for S-Plus Paul Mielke, Jr., and Ken Berry's multi-response
permutation procedures, special cases of which are permutation versions of
standard multivariate tests. The workhorse part of the routine is written
in C, for which I have compiled a dll for Windows machines; I would provide
the code for UNIX and other compilation, though I wouldn't be able to
provide guidance for that.
Primary references for the methods are:
Mielke, Paul W., Jr., The application of multivariate permutation methods
based on disstance functions in the earth sciences, Earth-Science Reviews,
31:55-71, 1991.
Mielke, Paul W., Jr. and Berry, Kenneth J., Multi-response permutation
procedures for a priori classifications, Comm. in Stat.-Theor. Meth.,
A5(14):1409-1424, 1976.
Mielke, Paul W., Jr. and Berry, Kenneth J., Permutation tests for common
locations among samples with unequal variances, J. Educ. and Behav. Stat.,
19(3):217-236, 1994.
The routines I have written include print, summary, and update methods, and
I'm working on a routine to use the methodology for classification.
Further, I have an associated help page. (For windows machines these are
included in a larger library which also has menus and dialog boxes.)
Let me know if you're interested and I can forward you the code.
Brad
Brad Biggerstaff, Ph.D.
Mathematical Statistican
Centers for Disease Control and Prevention
National Center for Infectious Diseases
Division of Vector-Borne Infectious Diseases
P.O. Box 2087
Fort Collins, CO 80522-2087 U.S.A.
(970) 221-6473 bkb5@cdc.gov
-----Original Message-----
From: Lutz Prechelt [mailto:prechelt@ira.uka.de]
Sent: Wednesday, January 26, 2000 3:14 AM
To: s-news@wubios.wustl.edu
Subject: [S] Multivariate hypothesis tests
Hi all,
I am looking for S implementations of multivariate significance
tests.
Neither the S-Plus 5 manual, nor VR2, nor statlib appear to have
any.
Specifically, I need to test two bivariate samples for
a difference in means. Both variables are from continuous
distributions but one has a strong ceiling effect and the
other I would rather also not trust to be normally distributed.
Any hints, please?
Thanks in advance
Lutz
Lutz Prechelt http://wwwipd.ira.uka.de/~prechelt/ | Whenever you
Institut f. Programmstrukturen & Datenorganisation | complicate things,
Universitaet Karlsruhe; 76128 Karlsruhe; Germany | they get
(Phone: +49/721/608-4068, FAX: +49/721/608-7343) | less simple.
>>> Ever had negative research results? http://wwwipd.ira.uka.de/fnr <<<
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