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I am using 1 WAy ANOVA and Tukey post hoc to compare some data which is all located in one table. In the 'significant?' column some of the combinations of groups is 'not tested'
- why is this
-can I change it?
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this is due to the way the Tukey test works. Read more at http://en.wikipedia.org/wiki/Tukey's_range_test#Order_of_comparisons
With Tukey's test, you sometimes simply don't need some of the comparisons that are possible, as they would be redundant.
If you want to have all comparisons in a posthoc test, choose Bonferroni-Holm or Holm-Sidak.