[英]dataframe previous rows mean
I have the following dataframe, and want to create a new column 'measurement_mean', I expect the value of each row in the new column, to be the mean of all the previous 'Measurement' values. 我有以下数据框,并希望创建一个新列“ measurement_mean”,我希望新列中每一行的值都是所有先前“ Measurement”值的均值。
How can I do this? 我怎样才能做到这一点?
Measurement
0 2.0
1 4.0
2 3.0
3 0.0
4 100.0
5 3.0
6 2.0
7 1.0
df[‘measurement_mean’] = df.Measurement.expanding().mean()
df['measurement_mean'] = df.Measurement.cumsum()/(df.index+1)
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