If you are testing a prediction that involves planned contrasts, then
your proposal should have
a contrast codes table. When you put together a contrast code table,
you should do two things.
First, you should make sure your contrasts are orthogonal, in that,
they sum to zero. Second,
you should be able to determine easily what the contrasts are comparing.
For example:
1. Compares the depression
ratings for participants classified as collectivists or individualists.
2. Compares the depression
ratings for participants in the ability-lower condition against
those in the ability-same and ability-higher.
3. Compares depression ratings
for participants classified as collectivists or individualists in
the opinion-disagree condition.
4. Compares depression ratings
for participants classified as collectivists or individualists in
the ability-higher condition.
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