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Analysis_of_Variance

# Analysis_of_Variance - Analysis of Variance Dr Myril...

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04/26/11 1 Analysis of Variance Dr. Myril Hillman

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04/26/11 2 Types of ANOVAS “Between Groups ANOVA”: Samples separate, independent or “Repeated Measures ANOVA” : “the same persons tested again and again.
04/26/11 3 One-Way and Two-Way ANOVAS One-Way: analyzes one variable, one “factor” Example: “Residency Two-Way: analyses two variables, two “factors” Example: “Residency” and “Gender”

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04/26/11 4 Two Way ANOVAS Yields “main effects” for the two variables/factors Yields “interaction effects”, an individual groups which takes into account the two variables/factors
04/26/11 5 Levels of a Variable Each variable, “factor” can have several “levels” Example: Residency had three levels in our study Example: Gender had two levels

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04/26/11 6 ANOVA: F test F= variance between groups variance within groups
04/26/11 7 Variance Estimates Called “mean squares” or MS So, F = MS between groups MS within groups or F = MSbg MS wi

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04/26/11 8 Meaning of MS MS : the sum of squares N-1 _ Sum of (X-X) 2 N-1
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Analysis_of_Variance - Analysis of Variance Dr Myril...

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