| EDMA FORM | GPA SHAPE (one sample) | GPA SHAPE (two sample) | Centroid Size | Centroid size R2
|
---|
GS v Atlas | 0.010 | <0.001 | <0.001 | <0.001 | 0.96 |
GS v Improved Atlas | 0.083 | 0.076 | 0.091 | <0.001 | 0.97 |
GS v MAAP | 0.476 | 0.1399 | 0.157 | <0.001 | 0.95 |
- For EDMA, we used the Form procedure of the WinEDMA (Cole, 2002), which used a permutation test with 100,000 replicates to establish the significance. For GPA we used the testmeanshapes function from R shapes package. A permutation test was used for the one sample test (assuming exchangeability between groups), whereas a bootstrap procedure was used for two-sample test. 50,000 replicates were used in both cases. Because the number of samples were low for a true multivariate test such as Hotelling T^2, we reported the Goodall F-test metric which uses the sum-of-squared Procrustes distances to measure SS (Goodall, 1991). This test is also known as Procrustes ANOVA. A paired t-test was used to compare centroid size estimates. All comparisons were run as separate statistical tests. All groups contained the identical set of samples (N = 36 per group). Adjusted R2 results are from linear regressions of centroid size from automated methods on GS centroid size