selectMPWI: Maximum Posterior Weighted Information (MPWI) Item Selection

In akaat/MTBfx: Functions to support Mobile Toolbox analysis

Maximum Posterior Weighted Information (MPWI) Item Selection

Description

This function is utilized by the GRM engine to select the next item using the MPWI item selection method. It is called within the engine, but can be used independently, if so desired.

Usage

selectMPWI(matrixInfo, currentProbGrid, nItems)

Arguments

matrixInfo	This is the information matrix for the item bank calulated using the matrixInfoGRM() function. The information matrix should have been called by the GRM engine prior to item selection. But if used alone, this will need to be applied.
currentProbGrid	The probability grid must be supplied to weight the item information matrix. It may be the normal density (e.g., if no items have been calculated), or it may be the density of the current EAP score estimate.
nItems	The number of items in the item bank.

Value

After running MPWI item selection, a vector is returned equal in length to the number of items in the item bank. The values are item information (across all categories) weighted by the current probability grid.

See Also

Other GRM_CAT functions: calcEAP(), grmCAT(), matrixInfoGRM()

akaat/MTBfx documentation built on June 6, 2023, 11:43 p.m.