getNextItem: Computes next item to present

In LearningRaph/felix: A Computer Adative Testing Wrapping Package

Description

This function selects the next item to be administered, given the list of previously administered items and the current ability estimate.

Usage

getNextItem(
  theta,
  items,
  itemsParameters,
  itemsAnswered,
  responses,
  D = 1.7,
  model = NULL,
  criterion = "MFI"
)

Arguments

theta	numeric: the ability estimate
items	character: vector of items Ids
itemsParameters	numeric: matrix of the parameters of all available items
itemsAnswered	numeric: vector of the position of answered items in the "items" vector
responses	numeric: vector of responses to previous items
D	numeric: metric constant (1 for logistic models, 1.7 for normal models)
model	Either NULL for dichotomous models, or one of the following for polytomous models : "GRM", "MGRM", "PCM", "GPCM", "RSM" and "NRM"
criterion	character: method for next item selection. Possible values are : "MFI", "bOpt", "thOpt", "MLWI", "MPWI", "MEI", "MEPV", "progressive", "proportional", "KL", "KLP", "GDI", "GDIP" and "random".

Value

character: Id of the next item to present

LearningRaph/felix documentation built on Nov. 22, 2019, 8:07 a.m.