[英]Rolling window correlation calculations for different time step in pandas
I have a DataFrame with returns for different securities across a few year. 我有一个DataFrame,其中包含几年内不同证券的收益。 I would like to calculate correlations in 100 day windows for the last day of every month.
我想计算每个月最后一天在100天窗口中的相关性。
rolcor = pd.rolling_corr(df2,window=100,pairwise = True)
Date Sec1 Sec2 Sec3 Sec4 ....
...
2006-01-24 0.000595 -0.009683 -0.004044 0.020969 ....
2006-01-25 0.013976 0.024152 -0.001015 0.019122 ....
2006-01-26 0.011730 0.008323 0.026423 -0.006254 ....
2006-01-27 0.020290 0.000000 0.014851 0.004196 ....
2006-01-30 0.046875 0.018937 0.000000 0.007660 ....
2006-01-31 -0.049118 -0.014852 -0.006829 -0.005529 ....
....
pd.rolling_corr
does the calculations, but they're done for all data points in the original DataFrame while I need only for the last day of each month. pd.rolling_corr
了计算,但是对原始DataFrame中的所有数据点都进行了计算,而我只需要每个月的最后一天。 Any suggestions how to do it? 有什么建议怎么办?
As I understand you only want to consider the price at the last day of the month 据我了解,您只想考虑当月最后一天的价格
periods = n
index = pd.date_range('2006-01-31', periods=n, freq='M')
print index
DatetimeIndex(['2006-01-31', '2006-02-28', ... , '2006-10-31'], dtype='datetime64[ns]', freq='M')
then use this to slice out the month end values. 然后用它切出月末值。
df2.loc[index]
Something tells me that is not what you want though? 告诉我那不是你想要的吗?
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