RosettaCodeData/Task/Permutation-test/Sidef/permutation-test.sidef

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func statistic(ab, a) {
var(sumab, suma) = (ab.sum, a.sum);
suma/a.size - ((sumab-suma) / (ab.size-a.size))
}
func permutationTest(a, b) {
var ab = (a + b);
var tobs = statistic(ab, a);
var under = (var count = 0);
ab.combinations(a.len).each { |perm|
statistic(ab, perm) <= tobs && (under += 1);
count += 1;
};
under * 100 / count;
}
var treatmentGroup = [85, 88, 75, 66, 25, 29, 83, 39, 97];
var controlGroup = [68, 41, 10, 49, 16, 65, 32, 92, 28, 98];
var under = permutationTest(treatmentGroup, controlGroup);
say ("under=%.2f%%, over=%.2f%%" % (under, 100 - under));