Table 3.

RMSE of all variables for four methods. The bottom line gives the overall RMSE for each method. For PCA, the RMSE calculation includes the correlations of the variables with themselves whereas for WALS these are excluded.

	PCA		WALS
	$\delta =0$	$\delta =0.14$	$\delta =0$	$\delta =-0.27$
	$\mathbf{R}$	${\mathbf{R}}_{{}_a}$	$\mathbf{R}$	${\mathbf{R}}_{{}_a}$
Pulse	0.2469	0.1618	0.1345	0.0948
CI	0.0945	0.1078	0.0482	0.0530
SI	0.1598	0.1158	0.0988	0.0857
DBP	0.1212	0.1540	0.0242	0.0239
PA	0.1390	0.1828	0.0196	0.0218
VP	0.3103	0.1336	0.0877	0.0883
logPR	0.0564	0.1275	0.0329	0.0521
All	0.1808	0.1426	0.0755	0.0662