def avariation(a,dimension=None):
    return 100.0*asamplestdev(a,dimension)/amean(a,dimension)
Gets any specified visitor clean-up timeout from the settings file, or
dataset/ETHPy150Open radlab/sparrow/src/main/python/third_party/stats.py/avariation--crossover with--dataset/ETHPy150Open bashu/django-tracking/tracking/utils.py/get_cleanup_timeout