| aiicor | Average Inter-Item Correlation with Optional Bootstrap Confidence Intervals |
| aiicorEigen | First eigenvalue from average inter-item association (Kaiser's formula) |
| APD | Average Proportional Distance (APD) |
| APDitem | Item-Level Average Proportional Distance (APDitem) |
| APDitemmg | Item-Level Average Proportional Distance for Multiple Groups (APDitemmg) |
| APDmg | Average Proportional Distance for multiple groups |
| rmsiic | Root-Mean-Square Inter-Item Correlation (Meyer, 1975) |