Table 1.

Statistical evaluation of the calibration method using the Wilcoxon rank-sum test.

Method	W	z	P value
x-axis	647	−3.95	<.001
y-axis	635	−4.13	<.001
z-axis	533	−5.64	<.001
RSSa	567	−5.14	<.001
PCAb	713	−2.98	.003

^aRSS: root sum square.

^bPCA: principal component analysis.