coef_alpha: Coefficient Alpha

In zief0002/QME: Classic test theory item analysis

Description

This function computes coefficient alpha using the covariance matrix.

Usage

coef_alpha(x, ...)

Arguments

x	is a data frame or matrix consisting of keyed item responses (0s and 1s).

Value

This function returns the value of coefficient alpha, the lower and upper limits of Feldt's (1965) method, and standard error of measurement for coefficient alpha.

Examples

library(QME)
data(math,math_key)
out = QMEtest(math, math_key)
x = getKeyedTestNoID(out)
coef_alpha(x)

zief0002/QME documentation built on May 4, 2019, 11:22 p.m.