Select your subject from the list to open the subject information on the right. Select the ‘Tag Groups’ tab to view a list of the tag groups associated with the subject.
The tag groups you can create to support IRT scoring are:
You can also create the IRT_Domain tag group containing tag values for which you want to generate an IRT theta value for statistical analysis.
For more information about each tag group, please see the IRT Tag Groups section of the ‘Subject Tags and Tag Groups’ help page in the in-built help.
Note: You must generate IRT theta values for items before you can add IRT tag values. You must add the tag values manually – these will not be updated automatically in Surpass.
Select a tag group to add a tag value.
To set up IRT scoring for an item, you must ensure you apply at least an IRT theta value for the IRT_B tag group. The value can be positive or negative.
When editing your test form, select the ‘Test Form Details’ tab.
Here, you can ‘Edit’ grade boundaries for your test form. Selecting this button will open a new window where you can add or remove grade boundaries.
Select the ‘Grade Boundary Type’ drop-down menu and select ‘IRT Score’. You can specify an IRT score for each grade boundary. You can also edit the values for the ‘IRT Range’, which will apply if the candidate answers everything either correctly or incorrectly, or if they do not attempt any questions.
Change the ‘Pass Mark’ type to ‘IRT Score’ using the drop-down menu and enter the IRT value you want to set as the pass mark for the section.
In delivery, the candidate must achieve the pass mark for all sections in order to pass the test.
Read this article to find out more about applying a scale score mapping file.