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Open Access Correction

Permutation test for periodicity in short time series data

Andrey A Ptitsyn1*, Sanjin Zvonic2 and Jeffrey M Gimble2

Author Affiliations

1 Center for Bioinformatics, Colorado State University Campus delivery 1682 Fort Collins, CO 80523, USA

2 Stem Cell Laboratory, Louisiana State University System Pennington Biomedical Research Center, 6400 Perkins Rd., Baton Rouge, LA 70808, USA

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BMC Bioinformatics 2007, 8:395  doi:10.1186/1471-2105-8-395

The electronic version of this article is the complete one and can be found online at:

Received:17 October 2007
Accepted:17 October 2007
Published:17 October 2007

© 2007 Ptitsyn et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In our paper reporting the permuted-time test for periodicity [1], the table in Figure 4 and the text of the Discussion should be modified as follows: The % of genes detected by Tu et al. [2] should be reported as 57.2% rather than 38.1% as currently reported; thus the difference between the methods should be reduced (to 84.7% vs. 57.2%). The discrepancy results from the fact that the absolute number of 3552 transcripts was identified from a smaller subset of pre-selected expression profiles corresponding to known yeast genes, while the Pt-test was applied to the entire set of probesets. We would like to thank two of the co-authors of the Tu et al. [2] publication, Drs. Rowicka and Kudlicki (UT-Southwestern), for bringing this to our attention.


  1. Ptitsyn AA, Zvonic S, Gimble JM: Permutation test for periodicity in short time series data.

    BMC Bioinformatics 2006, 7(Suppl 2):S10. PubMed Abstract | BioMed Central Full Text | PubMed Central Full Text OpenURL

  2. Tu BP, Kudlicki A, Rowicka M, McKnight SL: Logic of the yeast metabolic cycle: temporal compartmentalization of cellular processes.

    Science 2005, 310(5751):1152-1158. PubMed Abstract | Publisher Full Text OpenURL