Decision | H0 is true | H0 is false |
---|---|---|
Don't Reject H0 | OK | β = probability of type II error |
Reject H0 | α = probability of type I error | OK |
# Using the x; y interface:
t.test(x, y, alt = "two:sided") # H1: mean(x) != mean(y) (default)
t.test(x, y, alt = "less") # H1: mean(x) < mean(y)
t.test(x, y, alt = "greater") # H1: mean(x) > mean(y)
# Using the formula interface:
t.test(y ~ g, data = d, alt = "two:sided") # H1: level1 mean = level2 mean
t.test(y ~ g, data = d, alt = "less") # H1: level1 mean < level2 mean
t.test(y ~ g, data = d, alt = "greater") # H1: level1 mean > level2 mean
t.test()
anova()
chisq.test()
wilcox.test()
kruskal.test()
cor.test(method="spearman")