Table 6.

Estimates of variance components for the total model (number of factories = 68)

	Variance components in model excluding fixed effects (%)	Variance components in model including fixed effects (%)
Total between-worker variance	0.31 (58)	0.18 (34)
Between-factories variance	0.05 (9)	0.03 (5)
Between-department variance	0.07 (14)	0.02 (4)
Between-machines variance	0.07 (13)	0.04 (7)
Between-workers variance	0.12 (22)	0.09 (18)
Within-workers variance	0.22 (42)	0.20 (38)
Sum of variance explained by random effects	0.53 (100)	0.38 (72)
Total variance	0.53 (100)	0.53 (100)
Variance explained by fixed effects (%)	—	0.15 (28)