W7 - Repeated measures ANOVA

Repeated Measures ANOVA

A statistical test used to compare means across three or more related groups where the same participants are measured multiple times.

Error term

The variability in the data that cannot be explained by the independent variable(s), representing random differences or noise.

Statistical power

The probability that a test will correctly reject a false null hypothesis, meaning it detects a true effect.

Assumption of sphericity

The assumption that the variances of the differences between all combinations of related groups are equal.

Mauchly’s

A test (Mauchly’s test of sphericity) used to assess whether the assumption of sphericity has been violated.

epsilon

A value (ranging from 0 to 1) that estimates the degree to which sphericity is violated and is used to adjust degrees of freedom.

Greenhouse-Geisser

A correction method that adjusts degrees of freedom using epsilon to reduce the risk of Type I error when sphericity is violated.

Huynh-Feldt correction

A less conservative correction than Greenhouse-Geisser that also adjusts degrees of freedom when sphericity is violated.

compound symmetry

A condition where variances are equal across groups and covariances between pairs of groups are also equal, representing a stricter form related to sphericity.

Mixed model ANOVA

A statistical test used when a study includes both between-subjects factors (different groups of participants) and within-subjects factors (the same participants measured across multiple conditions or time points), allowing analysis of main effects and interactions between these factors.