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Test Statistic The test statistic is obtained by a rearrangement of the test statistic given in the previous section, noting that 02; = n.- 01,- in the special case of two rows. = 5,2 ---. (1) =- - (2) If a is approximately equal to b, as it should be unless there are many values equal to the grand median, the following simplification of the test statistic may be used. c 2 T= ELLw (Oli"' \"021) (3) The simplied form for T given in Equation 3 is exact if a = b. It is only approxi mate otherwise