ci.ratio.mean2 {statpsych} | R Documentation |
Computes a confidence interval for a ratio of population means of ratio-scale measurements in a 2-group design. Equality of variances is not assumed.
ci.ratio.mean2(alpha, y1, y2)
alpha |
alpha level for 1-alpha confidence |
y1 |
vector of scores for group 1 |
y2 |
vector of scores for group 2 |
Returns a 1-row matrix. The columns are:
Mean1 - estimated mean from group 1
Mean2 - estimated mean from group 2
Mean1/Mean2- estimated mean ratio
LL - lower limit of the confidence interval
UL - upper limit of the confidence interval
Bonett DG, Price RM (2020). “Confidence intervals for ratios of means and medians.” Journal of Educational and Behavioral Statistics, 45(6), 750–770. ISSN 1076-9986, doi: 10.3102/1076998620934125.
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.mean2(.05, y1, y2) # Should return: # # Mean1 Mean2 Mean1/Mean2 LL UL # [1,] 41.5 36.38462 1.140592 0.9897482 1.314425