Tutorial - EVD

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Outline

This tutorial will cover:

Overview

The Expression Value Distribution component plots a histogram of expression values versus their frequency of occurence. It is a useful tool for inspecting the data of an array or experiment. It can display results from a single or from multiple arrays. It also allows genes showing expression within a given range of values to be selected through use of range sliders. If the data has been classified into case/control groups, a t-test can be performed within the component. The resulting t-statistics for each gene are then displayed on the same type of histogram.

EVD for the file webmatrix2.exp after quantile normalization and log2 transformat.

Using the EVD component

1. Read in a microarray data file such as webmatrix2.exp (see the tutorial data download page).
2. View the data in the EVD component.
3. ....to be continued!!....