Function Chi-Square-2x2
(
chi-square-2x2 < v1 > < v2 > )
Performs a chi-square test for independence of the two variables, `v1' and
`v2.' These should be categorial variables with only two values; the function
will construct a 2x2 contingency table by counting the number of occurrences of
each combination of the variables. See the manual for more details.