item_phi: Calculate Item Phi

In rcrtan: Criterion-Referenced Test Analysis

Description

Calculate Item Phi

Usage

item_phi(data, items, cut_score, scale = "raw")

Arguments

data	A data frame of dichotomously scored test times
items	Raw column indices representing the test items
cut_score	A raw or percentage cut-score
scale	A character vector indicating whether the cut-score is 'raw' (default) or 'percent'

Value

Phi Item Phi values for items on the test

Examples

item_phi(bh_depend, 2:31, 21, scale = 'raw')

rcrtan documentation built on May 2, 2019, 2:10 a.m.