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. 2007 Aug 6;8:290. doi: 10.1186/1471-2105-8-290

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Copyright © 2007 Keller et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Example of possible running sum statistics. The figure shows all possible running sum statistics for an ordered list of 8 genes of which 4 belong to a functional category. The red labeled running sum statistic has a RS_Cvalue of 12 and the corresponding p-value is $1 - \frac{54}{70} = 0.229$ . The numbers on the x-axis refer to the index and the number of possible running sum values in the current step.