This function is the implementation of the two step approach for estimating surrogate
variables proposed by Leek and Storey 2007 PLoS Genetics. This function is primarily
included for backwards compatibility. Newer versions of the sva algorithm are available
svaseq, with low level functionality available
The transformed data matrix with the variables in rows and samples in columns
A factor variable giving the known batch levels
Other arguments to the
psva.D Data with batch effect removed but biological heterogeneity preserved
Elana J. Fertig
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