ci.reliability: Confidence interval for a reliability coefficient

In statpsych: Statistical Methods for Psychologists

Confidence interval for a reliability coefficient

Description

Computes a confidence interval for a population reliability coefficient such as Cronbach's alpha or McDonald's omega using an estimate of the reliability and its standard error. The standard error can be a robust standard error or bootstrap standard error obtained from an SEM program.

Usage

ci.reliability(alpha, rel, se, n)

Arguments

alpha	alpha level for 1-alpha confidence
rel	estimated reliability
se	standard error of reliability
n	sample size

Value

Returns a 1-row matrix. The columns are:

• Estimate - estimated reliability (from input)

• LL - lower limit of the confidence interval

• UL - upper limit of the confidence interval

Examples

ci.reliability(.05, .88, .0147, 100)

# Should return:
# Estimate         LL        UL
#     0.88  0.8489612 0.9065575
 

statpsych documentation built on Sept. 11, 2024, 7:42 p.m.