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vsn: Variance Stabilising Normalisation

Implementation for the Variance Stabilising Normalisation technique for bioinformatics data as seen in [1] and [2].

This normalisation algorithm aims to remove the dependence of the variance on the mean intensity for some form of microarray data.

[1] W. Huber, A. von Heydebreck, H. Sultmann, A. Poustka, and M. Vingron. Variance stablization applied to microarray data calibration and to quantification of differential expression. Bioinformatics, DOI:10.1093/bioinformatics/18.suppl_1.S96

[2] W. Huber, A. von Heydebreck, H. Sultmann, A. Poustka, and M. Vingron. Parameter estimation for the calibration and variance stabilization of microarray data. Statis- tical Applications in Genetics and Molecular Biology, Vol. 2: No. 1, Article 3, 2003. http://www.bepress.com/sagmb/vol2/iss1/art3

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Python Implementation of VSN algorithm

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