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How are "between" and "within" Treatments Different?

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How are "between" and "within" Treatments Different?

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Within Group: This is an estimate of the average random respondent variability on the dependent variable within a treatment group. and is based on deviation of individual scores from their respective group means.
For example if we have three groups A, B and each group have 3 observations
Group A: 3, 4, 5 The average of Group A is 4 and the ...

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