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.

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

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 April 4, 2025, 3:20 a.m.