Test for median.
Perform a signtest of the null hypothesis that x is from a distribution that has a zero median.
If the second argument m is a scalar, the null hypothesis is that X has median m.
If the second argument y is a vector, the null hypothesis is that
the distribution of x - y has zero median.
The argument "alpha" can be used to specify the significance level
of the test (the default value is 0.05). The string
argument "tail", can be used to select the desired alternative
hypotheses. If "alt" is "both" (default) the null is
tested against the two-sided alternative median (x) != m.
If "alt" is "right" the one-sided
alternative median (x) > m is considered.
Similarly for "left", the one-sided alternative median
(x) < m is considered. When "method" is "exact"
the p-value is computed using an exact method (this is the default). When
"method" is "approximate" a normal approximation is used for the
test statistic.
The p-value of the test is returned in pval. If h is 0 the null hypothesis is accepted, if it is 1 the null hypothesis is rejected. stats is a structure containing the value of the test statistic (sign) and the value of the z statistic (zval) (only computed when the ’method’ is ’approximate’.
Package: statistics