A 2-DIMENSIONAL KOLMOROGOV-SMIRNOV TEST FOR BINNED DATA

A new two-dimensional version of the Kolmorogov-Smirnov test has been developed for the testing of data which has been placed in a two-dimen sional array of bins. Monte Carlo testing has been used to derive the test statistics for 8 x 8, 16 x 16 and 32 x 32 arrays. The predicted p robabilities for non-square arrays and arrays with intermediate number s of elements are compared to the probabilities derived from Monte Car lo testing. The new test is applied to two-dimensional histograms of m ovement vectors derived from electrical impedance images of the stomac h.