One-Way Repeated Measures ANOVA

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Lecture 5

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1
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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

2
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When is the One-Way Repeated Measures ANOVA useful?

when the levels of an IV are related

3
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What is Sphericity?

a general condition of “compound symmetry”

  • similar to homogeneity of variance

  • covariance between pairs are equal

  • Mauchley’s test is SPSS

4
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What should you do if the assumption of Sphericity is violated?

  • use the Greenhouse-Geiser test (standard)

  • use the Huynh-Feldt statistics (more conservative)

5
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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