Module Three: Multiple Comparisons

ANOVA

is an Omnibus test, which means that it tells us that there is a difference but not where the difference is.

Polynomial contrasts

are only used when IV is ordinal.

ANOVA

is an Omnibus test, which means that it tells us that there is a difference but not where the difference is.

Polynomial contrasts

are only used when IV is ordinal.

Non orthogonal Contrasts

overlap or use the same "chunks "of variance in multiple comparisons.

Orthogonal Contrasts

compare unique "chunks "of variance.

Non Orthogonal

: Deviation, Simple, Repeated.

Family wise error rate

is the probability of making one or more false discoveries, or type I errors when performing multiple hypotheses tests.