QQ-plot Chart

This screen will display the Allelic Association test data in a Quantile-Quantile plot chart.
Selecting the QQ-plot node in the tree (1) will display this chart (2). It is a static png image containing all the markers of this Allelic Association test.

QQ-charts are drawn plotting the ascending ordered observed X² values against a random X² distribution with 1 degree of freedom. A departure of the expected value line depicts different kinds of departure from the null hypothesis (stratification bias in the case/control population, association…).
Refer to WTCCC Genome-wide association study (Nature. 2007 Jun 7;447(7145):645-6).