There are multiple definitions:

1. psychomotor development index(English)

   • MDI

2. Peters et al. Delusions Inventory(English)

   • designed to measure delusional ideation in the normal population, using the Present State Examination as a template. The multidimensionality of delusions was incorporated by assessing measures of distress, preoccupation, and conviction
   • JTC
   • Psychiatry, Psychosis
   • https://doi.org….schbul.a033401

3. polytomous discrimination index(English)

   • Statistics, Risk factor, Model(ing)
   • https://doi.org/10.1002/sim.9441