Hello,
We have a 4 condition block-design experiment, in which we would like to
look at several contrasts. Our questions are as follows:
1. Which is the best contrsat in order to see a difference between two
conditions, e.g., the 1st and 2nd:
t contrast: 1-100
or F contrast: 1000;0-100 (Is that a valid contrast for testing a
directional difference?)
We prefer using F contrasts as it is less restricting than t, however we
wonder whether it can be used for comparison of 2 conditions only.
2. Our experiment is based on a parametric hypothesis, according to which
cond1<cond2<cond3<cond4. What would be the best way to model this hypothesis
in a contrast?
Thank you for a rapid response,
Einat and Dafna
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