phi_domain: Calculate Brown's (1990) short-cut estimate for phi...

In gtlaflair/rcrtan: Criterion-Referenced Test Analysis

Description

Calculate Brown's (1990) short-cut estimate for phi dependability

Usage

phi_domain(data, items, total = NULL)

Arguments

data	A data frame of dichotomously scored test items
items	Raw column indices representing the test items or number of items on the test (see Details).
total	Total score column name of the test (see Details)

Details

When the item-level information is available, Kuder-Richardson 20 is used as an estimate of alpha. If only the total scores on the test are available and the number of items is known, Kuder-Richardson 21 is used as an estimate of alpha.

Value

The phi estimate for domain score dependability.

Examples

phi_domain(bh_depend, 2:31)

gtlaflair/rcrtan documentation built on May 24, 2021, 11:07 a.m.