In cwendorf/dgb: DGB

library(DGB)

Ratio of Means from Paired Samples

ci.ratio.mean.ps.data

Compute confidence interval for a ratio of population means of ratio-scale measurements in a paired-samples design. Equality of variances is not assumed.

Arguments: - alpha: alpha level for 1-alpha confidence - y1: vector of scores for condition 1 - y2: vector of scores for condition 2

Values: - means, mean ratio, lower limit, upper limit

alpha= .05
y1 = c(3.3, 3.6, 3.0, 3.1, 3.9, 4.2, 3.5, 3.3)
y2 = c(3.0, 3.1, 2.7, 2.6, 3.2, 3.8, 3.2, 3.0)
ci.ratio.mean.ps.data(alpha, y1, y2)

size.ci.ratio.mean.ps

Computes sample size required to estimate a ratio of population means with desired precision in a paired-samples design.

Arguments: - alpha: alpha level for 1-alpha confidence - var: planning value of measurement variance - m1: planning value of mean for measurement 1 - m2: planning value of mean for measurement 2 - cor: planning value for measurement correlation - r: desired upper to lower confidence interval endpoint ratio

Values: - required sample size

alpha = .05
var = 400
m1 = 150
m2 = 100
cor = .7
r = 1.2
size.ci.ratio.mean.ps(alpha, var, m1, m2, cor, r)

cwendorf/dgb documentation built on May 3, 2022, 9:35 p.m.