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OCR: Multiple Comparisons These commands offer different ways of comparing means statistically. Compare Each Pair command computes individual pairwise comparisons using Student's t t This test is sized for only an individual comparison If you make number of pairwise tests there no protection across the inferences, and thus the alpha -size (Type I) error rate across the hypothesis tests ic much higher than that for each individual test Compare All Pairs command gives test that IS sized for all differences among the means is the Tukey or Tukey-Kramer aSH (honestly significant difference) test (Tukey 1953 Kramer 1956 This test an exact alpha- level test if the sample sizes are the same and conservative the sample sizes are different (Hayter 1984) Compare with Best command tests whether means are l ...