Table 5.
Sums of Squares | Percent of Total variance | Df | Mean Square | |
subjects | 2069.09 | 10.67 | 17 | 121.71 |
MDI items | 11275.05 | 58.13 | 12 | 939.59 |
Test vs. retest (trials) | 1.68 | 0.01 | 1 | 1.68 |
subjects by items | 5631.18 | 29.03 | 204 | 27.60 |
subjects by trials | 103.86 | 0.54 | 17 | 6.11 |
items by trials | 8.38 | 0.04 | 12 | 0.70 |
subjects by items by trials | 307.08 | 1.58 | 204 | 1.51 |
Total | 19396.32 | 100.00 | 467 | 41.53 |
They suggest that only 0.01% of total variance is due to differences inherent to the test-retest procedure, with an additional 2.16% (0.54+0.04+1.58) attributable to the interaction of this procedure with subjects and the test itself. This is obviously a very low rate.