ci.ratio.median.ps: Confidence interval for a paired-samples median ratio

In statpsych: Statistical Methods for Psychologists

Confidence interval for a paired-samples median ratio

Description

Computes a distribution-free confidence interval for a ratio of population medians in a paired-samples design. Ratio-scale measurements are assumed.

Usage

ci.ratio.median.ps(alpha, y1, y2)

Arguments

alpha	alpha level for 1-alpha confidence
y1	vector of scores for measurement 1
y2	vector of scores for measurement 2 (paired with y1)

Value

Returns a 1-row matrix. The columns are:

• Median1 - estimated median for measurement 1

• Median2 - estimated median for measurement 2

• Median1/Median2 - estimated ratio of medians

• LL - lower limit of the confidence interval

• UL - upper limit of the confidence interval

References

\insertRef

Bonett2020bstatpsych

Examples

y1 <- c(21, 4, 9, 12, 35, 18, 10, 22, 24, 1, 6, 8, 13, 16, 19)
y2 <- c(67, 28, 30, 28, 52, 40, 25, 37, 44, 10, 14, 20, 28, 40, 51)
ci.ratio.median.ps(.05, y1, y2)

# Should return:
# Median1  Median2   Median1/Median2        LL        UL
#      13       30         0.4333333 0.3094838 0.6067451

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