TABLE VI.

USS ANOVA for Model 2.

Source of variation	Degrees of freedom	Mean square	Expected mean square
Transducer (T)	nT −1	$S_T^2$	${\theta }_T={\sigma }_E^2+n_S{r}_H{\sigma }_P^2$
Sonographer (S)	nS −1	$S_S^2$	${\theta }_S={\sigma }_E^2+n_T{r}_H{\sigma }_S^2$
Replicates	N−nT−nS+1	$S_{E^{\ast }}^2$	${\theta }_E={\sigma }_E^2$