| td_calibrate | Calibrate each language group separately |
| td_dif | Robust linking, anchor selection and small-sample DIF |
| td_features | Which item features predict DIF? |
| td_impact | Does item-level DIF add up to different pass rates? |
| td_mh | Mantel-Haenszel DIF with purification (conventional baseline) |
| td_report | Draft a comparability report |
| td_simulate | Simulate a source-language and a translated administration with known DIF |