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st: New version of -qqvalue- on SSC
From
Roger Newson <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: New version of -qqvalue- on SSC
Date
Fri, 7 Jan 2011 22:00:15 +0000
Thanks as always to Kit Baum (who has very kindly done the upload before
leaving Boston), a new version of the -qqvalue- package is now available
for download from SSC. In Stata, use the -ssc- command to do this, or
-adoupdate- if you already have an old version of -qqvalue-.
The -qqvalue- package is described as below on my website. The new
version has the same ado-file as before, but the on-line help now
contains a reference (and a hyperlink) to my Stata Journal article on
-qqvalue- (out earlier this week), which contains the methode and
formulas. Users are recommended to buy a copy of this article if they
have not already subscribed to The Stata Journal.
Best wishes
Roger
--
Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: [email protected]
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/
Opinions expressed are those of the author, not of the institution.
----------------------------------------------------------------------------------
package qqvalue from http://www.imperial.ac.uk/nhli/r.newson/stata10
----------------------------------------------------------------------------------
TITLE
qqvalue: Generate frequentist q-values by inverting multiple-test
procedures
DESCRIPTION/AUTHOR(S)
qqvalue is similar to the R package p.adjust. It inputs a single
variable, assumed to contain P-values calculated for multiple
comparisons, in a dataset with 1 observation per comparison. It
outputs a new variable, containing the q-values corresponding to
these P-values, calculated by inverting a multiple-test procedure
specified by the user. These q-values represent, for each
corresponding P-value, the minimum uncorrected P-value threshold
for which that P-value would be in the discovery set, assuming that
the specified multiple-test procedure was used on the same set of
input P-values to generate a corrected P-value threshold. These
minimum uncorrected P-value thresholds may represent familywise
error rates or false discovery rates, depending on the procedure
used. Optionally, qqvalue may output other variables, containing
the various intermediate results used in calculating the
q-values. The multiple-test procedures available for
qqvalue are a subset of those available using the multproc module
of the smileplot package, which can be downloaded from SSC.
Author: Roger Newson
Distribution-Date: 07january2011
Stata-Version: 10
INSTALLATION FILES (click here to install)
qqvalue.ado
qqvalue.sthlp
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(click here to return to the previous screen)
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