ci.rel2: Confidence interval for a 2-group reliability difference

In statpsych: Statistical Methods for Psychologists

Confidence interval for a 2-group reliability difference

Description

Computes a 100(1 - alpha)% confidence interval for a difference in population reliabilities in a 2-group design. This function can be used with any type of reliability coefficient (e.g., Cronbach alpha, McDonald omega, intraclass reliability). The function requires a point estimate and a 100(1 - alpha)% confidence interval for each reliability as input.

For more details, see Section 2.15 of Bonett (2021, Volume 4)

Usage

ci.rel2(rel1, ll1, ul1, rel2, ll2, ul2)

Arguments

rel1	estimated reliability for group 1
ll1	lower limit for group 1 reliability
ul1	upper limit for group 1 reliability
rel2	estimated reliability for group 2
ll2	lower limit for group 2 reliability
ul2	upper limit for group 2 reliability

Value

Returns a 1-row matrix. The columns are:

• Estimate - estimated reliability difference

• LL - lower limit of the confidence interval

• UL - upper limit of the confidence interval

References

\insertRef

Bonett2021statpsych

\insertRef

Bonett2015statpsych

Examples

ci.rel2(.4, .35, .47, .2, .1, .32)

# Should return:
# Estimate   LL     UL
#      0.2 0.07 0.3221
 

statpsych documentation built on Jan. 13, 2026, 1:07 a.m.