ci.sign: Confidence interval for the parameter of the one-sample sign...

In statpsych: Statistical Methods for Psychologists

Confidence interval for the parameter of the one-sample sign test

Description

Computes an adjusted Wald interval for the population proportion of quantitative scores that are greater than the null hypothesis value of the population median in a one-sample sign test. This proportion is a measure of effect size that can be reported along with the sign test.

For more details, see Section 1.25 of Bonett (2021, Volume 1)

Usage

ci.sign(alpha, y, h)

Arguments

alpha	alpha level for 1-alpha confidence
y	vector of y scores
h	null hypothesis value for population median

Value

Returns a 1-row matrix. The columns are:

• Estimate - adjusted estimate of proportion

• SE - adjusted standard error

• LL - lower limit of adjusted Wald confidence interval

• UL - upper limit of adjusted Wald confidence interval

References

\insertRef

Agresti1998statpsych

\insertRef

Bonett2021statpsych

Examples

y <- c(30, 20, 15, 10, 10, 60, 20, 25, 20, 30, 10, 5, 50, 40, 20, 10,
        0, 20, 50)
ci.sign(.05, y, 9)

# Should return:
# Estimate        SE        LL        UL
# 0.826087 0.0790342 0.6711828 0.9809911

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