def _invariant(self, rank, n):
        """Computes the delta value for the sample."""
        minimum = n + 1

        for i in self._invariants:
            delta = i._delta(rank, n)
            if delta < minimum:
                minimum = delta

        return math.floor(minimum)
def _invariant ( self , rank , n ) : minimum = n + 1 for i in self . _invariants : delta = i . _delta ( rank , n ) if delta < minimum : minimum = delta return math . floor ( minimum )
Computes the delta value for the sample.