ci.agree2: Confidence interval for G-index difference in a 2-group...

In statpsych: Statistical Methods for Psychologists

Confidence interval for G-index difference in a 2-group design

Description

Computes adjusted Wald confidence intervals for the G-index of agreement within each group and the difference of G-indices.

For more details, see Section 3.5 of Bonett (2021, Volume 3)

Usage

ci.agree2(alpha, n1, f1, n2, f2, k)

Arguments

alpha	alpha level for 1-alpha confidence
n1	sample size (objects) in group 1
f1	number of objects rated in agreement in group 1
n2	sample size (objects) in group 2
f2	number of objects rated in agreement in group 2
k	number of rating categories

Value

Returns a 3-row matrix. The rows are:

• Row 1: G-index for group 1

• Row 2: G-index for group 2

• Row 3: G-index difference

The columns are:

• Estimate - maximum likelihood estimate of G-index and difference

• SE - standard error

• LL - lower limit of adjusted Wald confidence interval

• UL - upper limit of adjusted Wald confidence interval

References

\insertRef

Bonett2022statpsych

\insertRef

Bonett2021statpsych

Examples

ci.agree2(.05, 75, 70, 60, 45, 2)

# Should return:
#         Estimate      SE     LL     UL
# G1        0.8667 0.02880 0.6975 0.9481
# G2        0.5000 0.05590 0.2523 0.6852
# G1 - G2   0.3667 0.06289 0.1117 0.6089               

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