itemListToDeltaDots: itemListToDeltaDots

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

itemListToDeltaDots

Description

Taskes a list of item parameter matricies and returns a data frame containing delta dots. This is mostly an internal function used, for example to plot items on Wright Maps.

Usage

itemListToDeltaDots(myItems)

Value

A data frame including 4 columns:

• id, an integer index reflecting which item this is, in the same order as myItems

• itemid, a string with the names from the items in myItems (NA if item list is not named)

• location, the value of the deta dot

Examples

myItem <- matrix(
  c(
    0, -0.58    ,  0     , 1,  # delta+tau   thurst thresh (gamma)
    1, -0.58    ,  0.776 , 1,  # 0.196       -1.14
    2, -0.58    , -0.697 , 1,  # -1.277      -0.93
    3, -0.58    , -0.629 , 1,  # -1.209      -0.64
    4, -0.58    ,  0.55  , 1   # -0.03        0.25
    ), ncol =4, byrow=TRUE
 )
thrstThrsh(myItem)

conquestr documentation built on March 31, 2023, 6:02 p.m.