Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw
Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw
Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw
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i=1…,I indexes groups, j=1,…n i indexes members <strong>of</strong> group<br />
Source <strong>of</strong><br />
Variation<br />
Between<br />
Group<br />
Within<br />
Group<br />
I<br />
DF Sum <strong>of</strong> Squares<br />
(SS)<br />
−1<br />
N −<br />
I<br />
∑ ni ( Yi<br />
−Y<br />
∑ ∑ ( Yij<br />
−<br />
2<br />
)<br />
Y<br />
i j i<br />
2<br />
)<br />
Mean Square<br />
(MS)<br />
MSB =<br />
MSW =<br />
SSB<br />
DF<br />
SSW<br />
DF<br />
F-Ratio<br />
MSB<br />
MSW
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