Which of the following is a correct definition of sphericity? A. Sphericity is t

Question

Which of the following is a correct definition of sphericity?

A. Sphericity is the assumption that the variances of the observations within groups are equal.

B. Sphericity is the assumption that the variances of the observations for a specific subject are equal.

C. Sphericity is the assumption that the variances of the differences of observations within pairs of groups are equal.

D. Sphericity is the assumption that the variances of the differences of observations within pairs of subject are equal.

Explanation / Answer

Option d is correct

Sphericity is the assumption that the variance of the differences of observations within pairs of subjects are equal.

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