goreTest: Gore Test
In PMCMRplus: Calculate Pairwise Multiple Comparisons of Mean Rank Sums Extended

goreTest

R Documentation

Gore Test

Description

Performs Gore's test. The null hypothesis H_0: \theta_i = \theta_j~~(i \ne j) is tested against the alternative H_{\mathrm{A}}: \theta_i \ne \theta_j, with at least one inequality beeing strict.

Usage

goreTest(y, groups, blocks)

Arguments

`y`	a numeric vector of data values.
`groups`	a vector or factor object giving the group for the corresponding elements of `"y"`.
`blocks`	a vector or factor object giving the group for the corresponding elements of `"y"`.

Details

The function has implemented Gore's test for testing main effects in unbalanced CRB designs, i.e. there are one ore more observations per cell. The statistic is assymptotically chi-squared distributed.

Value

A list with class "htest" containing the following components:

method: a character string indicating what type of test was performed.
data.name: a character string giving the name(s) of the data.
statistic: the estimated quantile of the test statistic.
p.value: the p-value for the test.
parameter: the parameters of the test statistic, if any.
alternative: a character string describing the alternative hypothesis.
estimates: the estimates, if any.
null.value: the estimate under the null hypothesis, if any.

References

Gore, A. P. (1975) Some nonparametric tests and selection procedures for main effects in two-way layouts. Ann. Inst. Stat. Math. 27, 487–500.

Examples

## Crop Yield of 3 varieties on two
## soil classes
X <-c("130,A,Light
115,A,Light
123,A,Light
142,A,Light
117,A,Heavy
125,A,Heavy
139,A,Heavy
108,B,Light
114,B,Light
124,B,Light
106,B,Light
91,B,Heavy
111,B,Heavy
110,B,Heavy
155,C,Light
146,C,Light
151,C,Light
165,C,Light
97,C,Heavy
108,C,Heavy")
con <- textConnection(X)
x <- read.table(con, header=FALSE, sep=",")
close(con)
colnames(x) <- c("Yield", "Variety", "SoilType")
goreTest(y = x$Yield, groups = x$Variety, blocks = x$SoilType)

PMCMRplus documentation built on May 29, 2024, 8:34 a.m.