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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Between Mean Score Variance<br />
Degree to which mean score <strong>of</strong> rated subjects differ from grand mean<br />
1<br />
s<br />
2<br />
− ≅ σ<br />
b<br />
i<br />
−<br />
= ∑ I 1 i = 1<br />
I<br />
( ) ( ) m Y Y<br />
2<br />
• I = number <strong>of</strong> people being rated (# <strong>of</strong> TAs)<br />
• Y = mean score for each TA rated<br />
i<br />
• Y<br />
= overall mean <strong>of</strong> scores for whole sample<br />
• m = number <strong>of</strong> raters for each mean<br />
2<br />
b
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