ASC’s IRT Form Building Tool helps you build parallel test forms by providing real-time graphics of important IRT functions, including the response functions and information functions for forms, items, and the entire bank. |
The IRT Form Building Tool is a Microsoft Excel® spreadsheet to aid in the construction of parallel (equivalent) test forms using item response theory (IRT). Like ASC’s Angoff Analysis Tool, the Form Building Tool is straightforward: simply paste the IRT parameters into the blue input area, and the output tables and graphics will automatically update. Up to four forms can be constructed, with items assigned or deleted from each form by a “1” placed in the relevant cell, as seen below.
With IRT, parallel forms are constructed by designing forms to have equivalent test response functions (TRFs) and test information functions (TIFs). The Form Building Tool calculates both the TRF and TIF for each form, as well as a table of the mean and standard deviation of the IRT parameters for each form. The graphics and tables update in real time as you add/delete items, so the tool works interactively to help you design forms to be parallel.
Output includes:
Item response functions
Item information functions
Test response functions (for each form)
Test information functions (for each form)
Standard error of measurement functions (for each form)
Bank information function
Bank SEM function
Manual
The Form Building Tool comes with a PDF manual that provides detailed instructions as well as a a brief description of IRT for those not familiar with how IRT is utilized in form assembly. It is available for free download to help you evaluate whether the tool will aid your productivity.
Download the Form Building Tool Manual (212 KB, zipped, PDF)
Shipping
The Form Building Tool is shipped by email only. Once your payment is complete, you will receive an email with a copy of the tool.
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