For two matched-pair samples x and y, perform a sign test of the null hypothesis PROB (x > y) == PROB (x < y) == 1/2. Under the null, the test statistic b roughly follows a binomial distribution with parameters n
= sum (
x!=
y)
and p = 1/2.With the optional argument
alt
, the alternative of interest can be selected. If alt is"!="
or"<>"
, the null hypothesis is tested against the two-sided alternative PROB (x < y) != 1/2. If alt is">"
, the one-sided alternative PROB (x > y) > 1/2 ("x is stochastically greater than y") is considered. Similarly for"<"
, the one-sided alternative PROB (x > y) < 1/2 ("x is stochastically less than y") is considered. The default is the two-sided case.The p-value of the test is returned in pval.
If no output argument is given, the p-value of the test is displayed.