This version of the Help is no longer updated. See JMP.com/help for the latest version.

.
Publication date: 07/30/2020

Parameter Estimates

The Parameter Estimates report contains a table of estimated parameters for each item. The parameters provided depend on the model used in your analysis (1PL, 2PL, or 3PL).

Item

The test item.

Difficulty

The b parameter or the measure of the difficulty of the item. A histogram of the difficulty parameters is shown beside the difficulty estimates.

Discrimination

(Available only for 2PL and 3PL models.) The a parameter or the measure of the item discrimination. A histogram of the discrimination parameters is shown beside the discrimination estimates.

Lower Asymptote

(Available only for 3PL models.) The c parameter or a measure of guessing.

Want more information? Have questions? Get answers in the JMP User Community (community.jmp.com).