This document provides a human readable description of the vocabulary terms defined in the IMS Global Vocabulary Definition and Exchange (VDEX) file "imsqti_usagedatav3p0_distractorstatisticsglossary_v1p0.xml". The details of the vocabulary are:
| Vocabulary Identifier: | http://www.imsglobal.org/qti/qtiv3p0/imsqti_usagedatav3p0_distractorstatisticsglossary_v1p0 |
| Vocabulary Type: | glossaryOrDictionary |
| Registered Status: | true |
| Vocabulary Language: | en-US |
| Author: | Colin Smythe (IMS Global) and Mark McKell (IMS Global) |
| Issue Date: | 2021-12-20 |
| Version: | 1.0 |
| Status: | IMS Final Release |
| Base Specification: | Question and Test Interoperability (QTI): Usage Data Specification Version 3.0 |
| Keywords: | QTI 3.0, Usage Data, Distractor Statistics Glossary |
| Publisher: | IMS Global Learning Consortium Inc. |
| Copyright: | 2021 (c) IMS Global Learning 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: | The first formal release of this QTI Glossary as part of QTIv3.0. |
| License: | Users of products or services that include this document are hereby granted a worldwide, royalty-free, non-exclusive license to use this document. |
The set of terms for the vocabulary are described in the table below.
| Identifier | Caption | Status | Description |
|---|---|---|---|
| AISResponse | Average Item Score for Response | Final | Equal to the mean of the item scores for the group of individuals that selected the response option. |
| NumberChoosingResponse | The number of people choosing a specified response or getting a specified code. | Final | 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 | Final | 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. |
| PercentChoosingResponse | The percent of people choosing a specified response or getting a specified code. | Final | Equal to the percent of test takers that selected the response option. This can also be used for the percent of individuals that received a certain rating on a judged item such as an essay question. |
In the above Table, the possible values and interpretation for the status field are: