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Discrimination Index Report

This report measures the extent to which responses can discriminate between individuals who have high scores and those who have low scores. It is calculated for each question and each response.

Access to this option is only available if you have been granted the following sub User Permission of the Manage Reports User Permission: Execute Discrimination Index. See Report Builder User Permissions for instructions on granting or denying this permission.

On the ControlPanel:

  1. Click   on the Reports menu to expand it.
  2. Click Report Builder.
  3. Click next to Assessments/Surveys to expand the list.
  4. Click Discrimination Index.
  5. Select one of the following from the Assessment Type drop-down list:
  1. Select an Instance.
  2. Type the Lower Percentile. (Default=27)
  3. Type the Upper Percentile. (Default=73)
  4. Click Build Report.

Formula Used to Build This Report:

DI=(a-b) /n

Discrimination Index Report Descriptions

Column Description
Question Indicates the actual question.
Correct Answer Indicates the correct answer to the question.
Answer 1 Indicates the first incorrect answer given to the question.
Answer 2 Indicates the second incorrect answer given to the question.
Answer 3 Indicates the third incorrect answer given to the question.
Upper 27% Indicates the upper 27% percentile of users who attempted the test.
Lower 27% Indicates the lower 27% percentile of users who attempted the test.
Index of Discrimination Indicates the difference between the proportions of high and low scorers answering an item correctly.
Maximum Discrimination Indicates the highest possible index of discrimination for an item at a given level of difficulty.
Discriminating Efficiency Indicates the index of discrimination divided by the maximum discrimination.

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