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weighted average in python pandas Code Example
weighted average in python pandas 
In [5]: def grouped_weighted_avg(values, weights, by):
   ...:     return (values * weights).groupby(by).sum() / weights.groupby(by).sum()

In [6]: grouped_weighted_avg(values=df.wt, weights=df.value, by=df.index)
Out[6]: 
Date
01/01/2012    0.791667
01/02/2012    0.722222
dtype: float64
Source: stackoverflow.com



Python

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