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Combining evidence using p-values: application to sequence homology searches.

Bailey, T L, Gribskov, M·1998·Bioinformatics

Abstract

MOTIVATION: To illustrate an intuitive and statistically valid method for combining independent sources of evidence that yields a p-value for the complete evidence, and to apply it to the problem of detecting simultaneous matches to multiple patterns in sequence homology searches. RESULTS: In sequence analysis, two or more (approximately) independent measures of the membership of a sequence (or sequence region) in some class are often available. We would like to estimate the likelihood of the sequence being a member of the class in view of all the available evidence. An example is estimating the significance of the observed match of a macromolecular sequence (DNA or protein) to a set of patterns (motifs) that characterize a biological sequence family. An intuitive way to do this is to express each piece of evidence as a p-value, and then use the product of these p-values as the measure of membership in the family. We derive a formula and algorithm (QFAST) for calculating the statistical distribution of the product of n independent p-values. We demonstrate that sorting sequences by this p-value effectively combines the information present in multiple motifs, leading to highly accurate and sensitive sequence homology searches.

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Authors
Bailey, T. L., & Gribskov, M.
Venue
Bioinformatics
Published
1998-01-01
Volume
14
Issue
1
Pages
48-54
ISSN
  • 1367-4803 (ISSN-L)
  • 1367-4811
OpenAlex
W2131510173
Cited by
1,253
References
0
FWCI
4.73
Type
journal article
Language
en
Open access
closed

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