@classmethod
def wraa(cls, woba, lg_woba, pa, woba_scale=1.24):
    """
        Weighted Runs Above Average(wRAA)
        http://1point02.jp/
        :param woba: weighted on-base average
        :param lg_woba: weighted on-base average(league average)
        :param woba_scale: Weighted Runs Above Average scale(default:1.2
        :param pa: plate appearance
        :param woba_scale: weighted on-base average scale(default:1.24)
        :return: (float) wRAA
        """
    return round((woba - lg_woba) / woba_scale * float(pa), 1)
