numpy.average()有权重选项,但numpy.std()没有。有没有人建议解决方法?
numpy.average()
numpy.std()
接下来的简短“手动计算”如何?
def weighted_avg_and_std(values, weights): """ Return the weighted average and standard deviation. values, weights -- Numpy ndarrays with the same shape. """ average = numpy.average(values, weights=weights) # Fast and numerically precise: variance = numpy.average((values-average)**2, weights=weights) return (average, math.sqrt(variance))