我不是R的高级用户。无论如何，我只想对两个数据集进行Wilcox测试：
library(coin)
GroupA = c(2,4,3,1,2,3,3,2,3,1)
GroupB = c(3,5,4,2,4,3,5,5,3,2)
g = factor(c(rep("GroupA", length(GroupA)), rep("GroupB", length(GroupB))))
v = c(GroupA, GroupB)
ss = wilcox_test(v ~ g, distribution="exact")
我想要的是获取Zvalue并计算效果大小。ss是一个S4对象，当我打印它时，我看到它报告一个Z值，但是在ss @ statistic中找不到它。具有我期望值的唯一插槽是“测试统计量”，但是即使这是我执行测试时的z值：
slot(ss, 'teststatistic')
我得到错误：
no slot of name "teststatistic" for this object of class "ScalarIndependenceTest"
谁能给我一个提示吗？
printS4类的等效show方法是，可以使用进行检查getMethod。在这种情况下，
ss
#
# Exact Wilcoxon-Mann-Whitney Test
#
#data: v by g (GroupA, GroupB)
#Z = -2.1095, p-value = 0.0385
#alternative hypothesis: true mu is not equal to 0
getMethod("show","ScalarIndependenceTest")
#Method Definition:
#
# function (object)
# {
# distname <- switch(class(object@distribution), AsymptNullDistribution = "Asymptotic",
# ApproxNullDistribution = "Approximative", ExactNullDistribution = "Exact")
# RET <- list(statistic = setNames(object@statistic@teststatistic,
# nm = "Z"), p.value = object@distribution@pvalue(object@statistic@teststatistic),
# alternative = object@statistic@alternative, data.name = varnames(object@statistic),
# method = paste(distname, object@method))
#...
#...
# }
ss@statistic@teststatistic
# GroupA
#-2.109531
ss@distribution@pvalue(ss@statistic@teststatistic)
#[1] 0.03850484
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