Table 3

Variance component results of a 29 participants, two judges and three Medical Judgment Vignettes stations

Source of Variation

df

Mean Squares

Variance Component

Variance Explained


Participants (p)

28

6.597

0.765

41.69

Judges (j)

1

0.508

0.003

0.16

MJV Stations (s)

2

0.089

-0.031

0.00

p × j

28

0.118

-0.002

0.00

p × s

56

2.001

0.938

51.12

j × s

2

0.227

0.004

0.22

pjs, e

56

0.125

0.125

6.81

Total

100.00


Note: negative variance component estimates may occur – in this present study, the reason for their occurrence is that the true value of the variance equals zero.

Donnon and Paolucci BMC Medical Education 2008 8:58   doi:10.1186/1472-6920-8-58

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