ci.stdmean1 {statpsych} | R Documentation |
Confidence interval for a single standardized mean
Description
Computes a confidence interval for a population standardized mean difference from a hypothesized value. If the hypothesized value is set to 0, the reciprocals of the confidence interval endpoints gives a confidence interval for the coefficient of variation.
Usage
ci.stdmean1(alpha, m, sd, n, h)
Arguments
alpha |
alpha level for 1-alpha confidence |
m |
estimated mean |
sd |
estimated standard deviation |
n |
sample size |
h |
hypothesized value |
Value
Returns a 1-row matrix. The columns are:
Estimate - estimated standardized mean difference
adj Estimate - bias adjusted standardized mean difference estimate
SE - standard error
LL - lower limit of the confidence interval
UL - upper limit of the confidence interval
References
Bonett DG (2008). “Confidence intervals for standardized linear contrasts of means.” Psychological Methods, 13(2), 99–109. ISSN 1939-1463, doi:10.1037/1082-989X.13.2.99.
Examples
ci.stdmean1(.05, 24.5, 3.65, 40, 20)
# Should return:
# Estimate adj Estimate SE LL UL
# 1.232877 1.209015 0.2124335 0.8165146 1.649239