Dear ConQuest community,
In order to estimate the number of item strata (H) of a scale with dichotomously coded items according to Wright & Masters (1982, p. 92) I would like to calculate the item separation index (G). In ConQuest's documentation (manual, command reference, tutorials) I can't find any information about this index or its parts (adjusted item standard deviation and root mean square calibration error). Does anyone know a way to have ConQuest provide these measures? Is it possible to derive them from the item separation reliability?
Many thanks in advance!
Best regards,
Urs