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Open Access Open Badges Technical Note

RankProdIt: A web-interactive Rank Products analysis tool

Emma Laing* and Colin P Smith

Author Affiliations

Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK

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BMC Research Notes 2010, 3:221  doi:10.1186/1756-0500-3-221

Published: 6 August 2010



The first objective of a DNA microarray experiment is typically to generate a list of genes or probes that are found to be differentially expressed or represented (in the case of comparative genomic hybridizations and/or copy number variation) between two conditions or strains. Rank Products analysis comprises a robust algorithm for deriving such lists from microarray experiments that comprise small numbers of replicates, for example, less than the number required for the commonly used t-test. Currently, users wishing to apply Rank Products analysis to their own microarray data sets have been restricted to the use of command line-based software which can limit its usage within the biological community.


Here we have developed a web interface to existing Rank Products analysis tools allowing users to quickly process their data in an intuitive and step-wise manner to obtain the respective Rank Product or Rank Sum, probability of false prediction and p-values in a downloadable file.


The online interactive Rank Products analysis tool RankProdIt, for analysis of any data set containing measurements for multiple replicated conditions, is available at: webcite