def __nonzero__(self):
    return bool(self.host)
Corrects for ties in Mann Whitney U and Kruskal Wallis H tests.  See
dataset/ETHPy150Open chromium/web-page-replay/platformsettings.py/SystemProxy.__nonzero__--crossover with--dataset/ETHPy150Open radlab/sparrow/src/main/python/third_party/stats.py/ltiecorrect