def weighted_normalized_moments(self):
     return _moments.normalized_moments(self.weighted_central_moments, 3)
 def weighted_normalized_moments(self):
     return _moments.normalized_moments(self.weighted_central_moments, 3)
 def normalized_moments(self):
     return _moments.normalized_moments(self.central_moments, 3)
 def normalized_moments(self):
     return _moments.normalized_moments(self.central_moments, 3)