makeItemDfs: makeItemDfs

In conquestr: An R Package to Extend 'ACER ConQuest'

makeItemDfs

Description

takes in a list of item matrices and returns a list of data frames each representing the parameters given in the matrices. The return object is suitable to pass into conquestr::makeItemList to construct a lit of matrices where each matrix represent one item's set of item parameters. The structure of the matrix is the same as used in conquestr::simplef (a matrix of k categories by four (category score, delta dot, tau, discrimination)). A common use for this function is turn a list of item matrices into a flat data structure.

Usage

makeItemDfs(itemList)

Arguments

itemList

a list of item matrices. The structure of each matrix is the same as used in conquestr::simplef (a matrix of k categories by four (category score, delta dot, tau, discrimination)).

Value

a list.

Examples

nItems <- 10
myItemsDeltaDot <- data.frame(
  id= seq(nItems),
  itemid= NA,
  delta = runif (nItems, -4, 1) # nItems items in range -4,1
)
myItemsList <- conquestr::makeItemList(deltaDot = myItemsDeltaDot)

conquestr documentation built on June 8, 2025, 11:02 a.m.