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Lecture 5
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What is the One-Way Repeated Measures ANOVA used for?
studies with small subject samples and can be useful in tracking change over time
When is the One-Way Repeated Measures ANOVA useful?
when the levels of an IV are related
What is Sphericity?
a general condition of “compound symmetry”
similar to homogeneity of variance
covariance between pairs are equal
Mauchley’s test is SPSS
What should you do if the assumption of Sphericity is violated?
use the Greenhouse-Geiser test (standard)
use the Huynh-Feldt statistics (more conservative)
What are the limitations of the One-Way Repeated Measures ANOVA?
no explicit control group
changes observed may just be due to the effect of time
learning/accumulation effects from repeated tests