如何在 Python 的滚动平均值计算中忽略 NaN

问题描述

对于时间序列销售预测任务，我想创建一个表示过去 3 天平均销售额的特征.当我想预测未来几天的销售额时，我遇到了问题，因为这些数据点没有销售数据(NaN 值).Pandas 提供 rolling_mean()，但是当窗口中的任何数据点为 NaN 时，该函数会导致 NaN 输出.

For a time series sales forecasting task I want to create a feature that represents the average sales over the last 3 days. I have a problem when I want to predict the sales for days in the future, since these data points do not have sales data (NaN values). Pandas offers rolling_mean(), but that function results in a NaN ouput when any data point in the window is NaN.

我的数据:

Date    Sales
02-01-2013  100.0
03-01-2013  200.0
04-01-2013  300.0
05-01-2013  200.0
06-01-2013  NaN

使用窗口为 2 的 pd.rolling_mean() 后的结果:

Result after using pd.rolling_mean() with window of 2:

Date    Rolling_Sales
02-01-2013  NaN
03-01-2013  150.0
04-01-2013  250.0
05-01-2013  250.0
06-01-2013  NaN

想要的结果:

Date    Rolling_Sales
02-01-2013  NaN
03-01-2013  150.0
04-01-2013  250.0
05-01-2013  250.0
06-01-2013  200.0

因此，如果包含 NaN，我想忽略它并取窗口中所有其他数据点的平均值.

So in case the a NaN is included, I want to ignore it and take the average of all the other data points in the window.

推荐答案

这里正在添加 min_periods

s=df.Sales.rolling(window=2,min_periods=1).mean()
s.iloc[0]=np.nan
s
Out[1293]: 
0      NaN
1    150.0
2    250.0
3    250.0
4    200.0
Name: Sales, dtype: float64

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