On Jul 30, 2012, at 8:48 PM, arun wrote:
Hi,
Please check this article which details the method for comparison:
Statistica Sinica 17(2007), 1115-1137
TESTING FOR THE EQUALITY OF k REGRESSION
CURVES
Juan Carlos Pardo-Fern ́ndez, Ingrid Van Keilegom and Wenceslao
Gonz ́lez-Manteiga
Also, check some examples (http://www.stat.umn.edu/geyer/old/5601/examp/kolmogorov.html
).
Thanks, AK for that link. Geyer's heuristic explanation helps me
better understand the underpinnings of the KS test.
I am not very familiar with non-parametric tests.
A.K
________________________________
From: Luis Fernando García Hernández <luysgar...@gmail.com>
To: arun <smartpink...@yahoo.com>
Sent: Monday, July 30, 2012 9:00 PM
Subject: Re: [R] curve comparison
Thanks both for your answer,
Will, do you have any reference which shows me how how to perform
this analysis? I´d like to know to find out how to do it. In my
case data is similar to compare several diversity curves, I do not
know if you are familiar with them.
I wish I knew what a "diversity curve" was. You say below that these
curves are from regression procedures, so there are probably
theoretical results that would support a more statistically powerful
procedure than resorting to KS tests.
Two points:
--- You may get a more knowledgeable audience in one of the SIG
mailing lists.
https://stat.ethz.ch/mailman/listinfo/r-sig-epi
https://stat.ethz.ch/mailman/listinfo/r-sig-phylo
--- If you want non-ecologists to help, you will need to provide some
examples that better document what procedures you have been using.
--
David.
Related to the Kolmogrov Smirnov test, I´ll try, I did not know it
allowed curve comparison.
This is a great space to share questions, so thanks both for your
answer!
2012/7/30 arun <smartpink...@yahoo.com>
Hello,
You could try some non-parametric tests for comparison such as
Kolmogorov-Smirnov test (ks.test() package: truncgof)or Cramer-von
Mises test (cvmts.pval() package: CvM2SL2Test).
A.K.
----- Original Message -----
From: Luis Fernando García Hernández <luysgar...@gmail.com>
To: r-help@r-project.org
Cc:
Sent: Monday, July 30, 2012 1:38 AM
Subject: [R] curve comparison
Dear R users,
I have seven regression lines I´d like to compare, in order to find
out if
these are significatively different. The main problem is that these
are
curves, non normal, non homogeneous data, I´ve tried to linearize
them but
it has not worked. So I´d like to know if you know any command or
source in
R which explains how to perform this kind of comparison.
Thanks in advance for your help!
[[alternative HTML version deleted]]
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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