目前正在网H股ETF，进行了接近一年了还没出清，虽然已盈利，但相对于50ETF来说现在想它还真不是好品种，不考虑强周期、通胀、流动性等因素，仅就网格的最大影响因素波动性来讲，它就比不上50ETF。以前不会统计，现在学了点Python，自己写了小程序计算了下，先上结果：

volatility(510050vs510900).png

图中蓝色为50ETF，可以看出，过去三年来它的日波动性明显强于H股ETF。

下面就以50ETF和H股ETF为例，统计这两个投资品种的日波动率，其他品种、其他周期类似处理即可。附上代码：

# -- coding: utf-8 --

"""

Created on Sat Jul 09 12:03:03 2016

@author: forestgumpgg(雪球ID、聚宽ID)，欢迎关注，共同讨论量化分析之道

比较上证50ETF(510050)和H股ETF(510900)的日波动率

日波动率=sqrt[(最高值-收盘值)^2 + (最低值- 收盘值) ^2]

"""

import pandas as pd

import matplotlib.pyplot as plt

import tushare as ts

import math

ts.set_token('********') #此次隐去了自己用的token

start_date = '2013-07-01'

end_date = '2016-06-30'

info510050 = ts.get_hist_data('510050', start= start_date, end=end_date)

info510050 = info510050.sort_index(axis = 'index', ascending = True)

info510050['day_volatility'] = (pow(info510050['high'] -info510050['close'] , 2) +

pow(info510050['low'] -info510050['close'] , 2) )

for i in range(0,len(info510050.index)):

info510050['day_volatility'][i] = math.sqrt(info510050['day_volatility'][i])

info510900 = ts.get_hist_data('510900', start=start_date, end=end_date)

info510900 = info510900.sort_index(axis = 'index', ascending = True)

info510900['day_volatility'] = (pow(info510900['high'] -info510900['close'] , 2) +

pow(info510900['low'] -info510900['close'] , 2) )

for i in range(0,len(info510900.index)):

info510900['day_volatility'][i] = math.sqrt(info510900['day_volatility'][i])

plt_title = 'volatility(50ETF vs H_ETF)'

plt_figsize = (16, 9) #unit is inch

plt.figure()

info510050['day_volatility'].plot(figsize = plt_figsize, title = plt_title, grid = True, legend =True)

info510900['day_volatility'].plot(figsize = plt_figsize, title = plt_title, grid = True, legend =True)

plt.legend(['50ETF','H_ETF'])

plt.savefig("volatility(510050vs510900).png")