def get_zscore(self, value):
        mean = self.mean
        if self.std_dev == 0:
            if value == mean:
                return 0
            if value > mean:
                return float('inf')
            if value < mean:
                return float('-inf')
        return (float(value) - mean) / self.std_dev
Get the z-score for *value* in the group. If the standard deviation
dataset/ETHPy150Open mahmoud/boltons/boltons/statsutils.py/Stats.get_zscore