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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Unique Rater Design (cont’d)<br />
2) Within Mean Score Variance: Degree to which individual<br />
scores differ from a subject’s mean score<br />
2<br />
1 I m<br />
2<br />
= ∑ ∑ Y Y<br />
w ( 1)<br />
ij i<br />
I m i = 1 j = 1<br />
( ) 2<br />
s − ≅ σ<br />
−<br />
Where:<br />
• I = number <strong>of</strong> individuals being rated (# <strong>of</strong> TAs)<br />
• R = number <strong>of</strong> raters<br />
•Yij = score <strong>of</strong> each individual rater<br />
Y<br />
• = mean score <strong>of</strong> each person rated<br />
i<br />
• m = number <strong>of</strong> raters for each mean<br />
Note: R=m<br />
w