spearmanBrown: Spearman-Brown formula

In ufs: A Collection of Utilities

Spearman-Brown formula

Description

Spearman-Brown formula

Usage

spearmanBrown(nrOfItems, itemReliability)

spearmanBrown_reversed(nrOfItems, scaleReliability)

spearmanBrown_requiredLength(scaleReliability, itemReliability)

Arguments

nrOfItems	Number of items (or 'subtests') in the scale (or 'test').
itemReliability	The reliability of one item (or 'subtest').
scaleReliability	The reliability of the scale (or, desired reliability of the scale).

Value

For spearmanBrown, the predicted scale reliability; for spearmanBrown_requiredLength, the number of items required to achieve the desired scale reliability; and for spearmanBrown_reversed, the reliability of one item.

Examples

spearmanBrown(10, .4);
spearmanBrown_reversed(10, .87);
spearmanBrown_requiredLength(.87, .4);

ufs documentation built on May 29, 2024, 10:30 a.m.