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HTTP/2 200 cache-control: no-cache, must-revalidate content-language: en content-type: text/html; charset=utf-8 date: Wed, 08 Oct 2025 10:44:33 GMT expires: Sun, 19 Nov 1978 05:00:00 GMT link: ; rel="canonical",; rel="shortlink" permissions-policy: interest-cohort=() strict-transport-security: max-age=0 traceresponse: 00-186c7e2a0d8c282a2e8bd448f33930f9-55dd2a302278e525-01 x-content-type-options: nosniff x-debug-info: eyJyZXRyaWVzIjowfQ== x-generator: Drupal 7 (https://drupal.org) x-platform-cache: MISS x-platform-cluster: iuhdadt23te24-master-7rqtwti x-platform-processor: 5qf2ujezmodwg3voquzfk3ccca x-platform-router: pr3zs2emag3zmfnbd6z7qjv6je 1EdTech QTI Glossary of Terms for Usage Data Distractor Statistics Version 1.0 Final | IMS Global Learning Consortium

1EdTech QTI Glossary of Terms for Usage Data Distractor Statistics

Vocabulary Details

This document provides a human readable description of the vocabulary terms defined in the 1EdTech Vocabulary Definition and Exchange (VDEX) file "distractorstatisticsglossaryv1p0.xml". The details of the vocabulary are:

Vocabulary Identifier:	https://www.imsglobal.org/qti/qtiv2p1/distractorstatisticsglossaryv1p0
Vocabulary Type:	glossaryOrDictionary
Registered Status:	true
Vocabulary Language:	en-US
Author:	Colin Smythe, 1EdTech (UK)
Issue Date:	2013-01-07
Version:	1.0
Status:	Final Release
Base Specification:	Question and Test Interoperability (QTI) Version 2.1
Keywords:	QTIv2.1, Usage Data, Distractor Statistics Glossary
Publisher:	1EdTech Consortium Inc.
Copyright:	2012 (c) 1EdTech Consortium Inc.
Description:	The set of terms that would be used to collect distractor statistics. This is the value that will be entered in the 'name' element.
History:	Version 1.0: The first formal release of this QTI Glossary.
License:	Users of products or services that include this document are hereby granted a worldwide, royalty-free, non-exclusive license to use this document.

Vocabulary Terms

The set of terms for the vocabulary are described in the table below.

Identifier	Caption	Description
AISResponse	Average Item Score for Response	Equal to the mean of the item scores for the group of indviduals that selected the response option.
NumberChoosingResponse	The number of people choosing a specified response or getting a specified code.	Equal to the number of individuals that selected the response option. This can also be used for the number of individuals that received a certain rating on a judged item such as an essay question.
PTbis-Response	r-pointbiserial for Response	A group-dependent measure of the discrimination of the response option, the pointbiserial correlation between selection of the response option and a criterion such as the total score on the test.
ParentChoosingResponse	The percent of people choosing a specified response or getting a specified code.	Equal to the percent of test takers that selected the response option. This can also be used for the percent of indviduals that received a certain rating on a judged item such as an essay question.

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