Non parametric MANOVA on precision measurements (distances between points).

Four crossed factors and their possible interactions were analyzed: superimposition technique (fixed factor; 5 techniques), point (fixed factor; 4 points), operator (random factor; 3 operators), and time (fixed factor; 2 time points). Data were transformed to log10(x). Analysis was based on Euclidean distances. Unrestricted permutation of raw data using correct permutable units was performed. No. of permutations used = 9999. R2 = 0.46%.1Pair-wise a posteriori tests among superimposition techniques within each point using the t-statistic (p * denotes statistical significance.3P: three-point registration; AC: anterior cranial base; AC + F: anterior cranial base + foramen magnum; BZ: both zygomatic arches; 1Z: one zygomatic archNon parametric MANOVA on precision measurements (distances between points).