# Glossary of Terms for Distractor Statistics

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Identifier | Caption | Description
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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.
PercentChoosingResponse | 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 individuals that received a certain rating on a judged item such as an essay question.
AIS-Response | Average Item Score for Response | Equal to the mean of the item scores for the group of individuals that selected the response option.
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.