def fa(a, b, alpha=2):
    """Returns the factor of 'alpha' (2 or 5 normally)
    """
    return np.sum((a > b / alpha) & (a < b * alpha), dtype=float) / len(a) * 100
def fa(a, b, alpha=2):
    
    return np.sum((a > b / alpha) & (a < b * alpha), dtype=float) / len(a) * 100
def fa ( a , b , alpha = 2 ) : return np . sum ( ( a > b / alpha ) & ( a < b * alpha ) , dtype = float ) / len ( a ) * 100
Returns the factor of 'alpha' (2 or 5 normally)
Returns the factor of alpha ( 2 or 5 normally )