Multivariate Methods • Item Analysis • Statistical Details for the Item Analysis Platform • Ability Formula
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Ability Formula
The Save Ability Formula option from the Item Analysis red triangle menu saves the ability formula to a new column in the data table. This formula can be used to score additional subjects added to the data table or it can be copied to a new table to score a new set of subjects.
The function saved to the data table is called the IRT Ability function. The item parameter estimates are stored in a matrix in this function.

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Help created on 10/11/2018