Table 1.

Generalizability theory study (G study) results for the scores of medical students (n = 46) in professional competencies using two PBL tutors as raters and four measurement occasions in PBL tutorials

Facets	df	SS	MS	Variance component	Percent variance
Students (s)	45.00	51.10	1.14	0.12	27.0%
Occasion (t)	3.00	16. 88	5.63	0.04	10.0%
Rater (r): t	4.00	7.23	1.81	0.03	8.0%
s × t	135.00	26.83	0.20	0.00	0.0%
s × r:t	180.00	42.48	0.24	0.24	55.0%
G coefficient: 0.80
Absolute SEM: 0.21

SS Sum of squares, MS Mean of squares, df Degree of freedom, SEM Standard error of measurement. The proportion of observed variance explained by each facet is calculated by dividing the individual variance component by the total observed variance