Results of principal component analysis on PEJC and PDS
| Variable | First PC | Second PC | Third PC | |
| PEJC | proportion of variance | 75.1% | 16.9% | 8.0% |
| coefficients: | ||||
| single | 0.531 | 0.847 | 0.004 | |
| paired | 0.599 | −0.373 | −0.708 | |
| chronological | 0.599 | −0.379 | 0.706 | |
| PDS | proportion of variance | 69.8% | 20.5% | 9.7% |
| coefficients: | ||||
| single | 0.511 | 0.859 | 0.024 | |
| paired | 0.610 | −0.342 | −0.715 | |
| chronological | 0.610 | −0.380 | 0.699 |