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.

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

Bonett2015statpsych

Examples

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

# Should return:
# Estimate   LL        UL
#      0.2 0.07 0.3220656
 

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