Item Characteristic Curves

Initializing live version
Download to Desktop

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.

In item response theory, an item characteristic curve describes the relationship between a latent ability and the performance on a test item. This Demonstration plots the item characteristic curves of two items. Change the item parameters to see the effect of different values.

Contributed by: Vincent Kieftenbeld (March 2011)
Open content licensed under CC BY-NC-SA



In the three-parameter logistic model, the probability that a person with ability level gives a correct response to an item with discrimination parameter , difficulty parameter , and pseudo-guessing parameter is modelled as .

Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.