ci.ratio.median2: Confidence interval for a 2-group median ratio

In statpsych: Statistical Methods for Psychologists

Confidence interval for a 2-group median ratio

Description

Computes a distribution-free confidence interval for a ratio of population medians of ratio-scale measurements in a 2-group design.

Usage

ci.ratio.median2(alpha, y1, y2)

Arguments

alpha	alpha level for 1-alpha confidence
y1	vector of scores for group 1
y2	vector of scores for group 2

Value

Returns a 1-row matrix. The columns are:

• Median1 - estimated median from group 1

• Median2 - estimated median from group 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

y2 <- c(32, 39, 26, 35, 43, 27, 40, 37, 34, 29, 49, 42, 40)
y1 <- c(36, 44, 47, 42, 49, 39, 46, 31, 33, 48)
ci.ratio.median2(.05, y1, y2)

# Should return:
# Median1 Median2 Median1/Median2       LL       UL
#      43      37        1.162162 0.927667 1.455933

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