【NumPy / SciPy】Pythonでデータの標準化 |NumPyの mean と std を使う方法。 In [1]: import numpy as np In [2]: x = [1,2,3,4,5,6,7,8,9] In [3]: x_copy = np.copy(x) In [4]: x_std = (x_copy - x_copy.mean()) / x_copy.std() In [5]: x_std Out[5]: array([-1.54919334, -1.161895 , -0.77459667, -0.38729833, 0. , 0.38729833, 0.77459667, 1.161895 , 1.54919334]) In [6]: np.mean(x_std) Out[6]: 0.0 In [7]: np.std(x_std) Out[7]: 1.0 mean, std を使った方法は Pandas でもできる
