idi: Item Discrimation Index

In cddesja/hemp: Handbook of Educational Measurement and Psychometrics Using R Companion Package

Description

Calculates the item discrimation index

Usage

idi(data, item, perc_cut, use = "complete.obs", na.rm = T)

Arguments

data	data frame
item	An item (as a vector)
perc_cut	A number that defines the upper and lower percentile to use for the high and low achieving groups
use	How should missing data be handled? See the cor function. Default is "complete.obs"
na.rm	logical. Should missing values be removed? Defualt is TRUE.

Value

The item discrimination index

Examples

idi(SAPA, SAPA$reason.4, perc_cut = .27)

cddesja/hemp documentation built on April 7, 2021, 9:24 p.m.