What is the purpose of the Rayleigh test when analyzing chemotaxis assays?
The Rayleigh test is a statistical test for the uniformity of a circular distribution of points (cell endpoints).
With p < 0.05, the null hypothesis (uniformity) is rejected, indicating a chemotaxis effect. Like all statistical tests, this one strongly depends on the number of analyzed cells.
Moore BR., 1980, A modification of the Rayleigh test for vector data, Biometrika, Volume 67, 175-180
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