Item Characteristic Curves

Requires a Wolfram Notebook System

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

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

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.