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$Id: README 1065 2009-05-14 10:28:59Z jari $

About Normalization package for BASE

The Normalization package for BASE (net.sf.basedb.normalization) plug-in set is a compilation of normalisers for expression data. See Documentation below for further information about the different plug-ins in this package. Common to the plug-ins provided with this package is that they work on bioassay set with either 1-channel or 2-channel. The algorithms are working on expression values, that is for 2-channel data, ratios ch1/ch2 are used.

Normalization package for BASE is free software. See the file license.txt for copying conditions.

The package was created, and is maintained, by Martin Svensson and Jari Hakkinen.


Normalization package for BASE can be obtained from


Installation instructions can be found in the 'INSTALL' file.


Average normalization

This plug-in scales the expression values for an assay with a factor, S, equal to the ratio of either i) the geometric mean of the expression values of all spots in the bioassay set divided by the assay average, or ii) a user defined value divided by the assay average.

The new expression values will become S times the original expression value.

Background subtraction and proper filtration have to be done before running this plug-in.

qQuantile normalization

Write me.

The qQuantile normalization is inspired by the 'Cubic Spline' normalization in Illumina Beadstudio and the work by Workman et al.,

Quantile normalization

In quantile normalization each assay data is sorted in ascending expression value order and added to a matrix as columns. The matrix rows will contain mixed probes (also known as reporters or genes) decided by their rank. For each row in the matrix, the expression values are replaced with the row average value. Finally, each assay is reordered into its original order to retain a standard expression matrix were each row represents one probe. Assays are not mixed.

Background subtraction and proper filtration should be done on the bioassay set before running this plug-in. The bioassay set must not contain any missing values.

Copyright (C) 2008 Jari Häkkinen, Martin Svensson
Copyright (C) 2009 Jari Häkkinen
This file is part of the Normalizers plug-in package for BASE
(net.sf.based.normalizers). The package is available at BASE main site is
This is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.
The software is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>.
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