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There are two ways to do this:
1. Planned Comparisons
You pick a defined set of comparisons. This gives you more power or a higher probability of finding a difference. But you can only do a small set of comparisons.
For example:
- 1ST YEAR & SOPH. (COMBINED) VS JUNIORS & SENIORS (COMBINED)
- 1ST YEAR VS SOPHOMORES
- JUNIORS VS SENIORS
(Note: there are only three comparisons. The second and third comparisons are nested inside the first (combined) comparison. These are called orthogonal comparisons. Orthogonal means independent. You can only test as many orthogonal comparisons as the DFBG(Number of Groups-1)
You may be interested in the fact that I did these tests and all the comparisons are significant.
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