ci.ratio.mad2 {statpsych} | R Documentation |
Confidence interval for a 2-group ratio of mean absolute deviations
Description
Computes a confidence interval for a ratio of population MADs (mean absolute deviation from median) in a 2-group design.
Usage
ci.ratio.mad2(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:
MAD1 - estimated MAD for group 1
MAD2 - estimated MAD for group 2
MAD1/MAD2 - estimate of MAD ratio
LL - lower limit of the confidence interval
UL - upper limit of the confidence interval
References
Bonett DG, Seier E (2003). “Confidence intervals for mean absolute deviations.” The American Statistician, 57(4), 233–236. ISSN 0003-1305, doi:10.1198/0003130032323.
Examples
y1 <- c(32, 39, 26, 35, 43, 27, 40, 37, 34, 29)
y2 <- c(36, 44, 47, 42, 49, 39, 46, 31, 33, 48)
ci.ratio.mad2(.05, y1, y2)
# Should return:
# MAD1 MAD2 MAD1/MAD2 LL UL
# 5.111111 5.888889 0.8679245 0.4520879 1.666253
[Package statpsych version 1.6.0 Index]