WRS2 (version 0.4-0)

yuend: Paired samples $t$-test on trimmed means.

Description

The function yuen performs Yuen's test for trimmed means, yuenbt is a bootstrap version of it. The pb2gen function performs a t-test based on various robust estimators.

Usage

yuend(x, y, tr = 0.2)

Arguments

x

an numeric vector of data values (e.g. for time 1).

y

an numeric vector of data values (e.g. for time 2).

tr

trim level for the means.

Value

Returns an object of class "yuen" containing:

test

value of the test statistic (t-statistic)

p.value

p-value

conf.int

confidence interval

df

degress of freedom

diff

trimmed mean difference

call

function call

Details

The test statistic is a paired samples generalization of Yuen's independent samples t-test on trimmed means.

References

Wilcox, R. (2012). Introduction to Robust Estimation and Hypothesis Testing (3rd ed.). Elsevier.

See Also

yuen

Examples

## Cholesterol data from Wilcox (2012, p. 197)
before <- c(190, 210, 300,240, 280, 170, 280, 250, 240, 220)
after <- c(210, 210, 340, 190, 260, 180, 200, 220, 230, 200)
yuend(before, after)