2.1.4.4.Missing Data
刪除Missing Data
刪除任何含有的column
df.dropna(axis = 1)
刪除任何含有NaN的row
df.dropna()
刪除NaN數量小於門檻值的row
df.dropna(thresh = 2)
置換Missing Data
換掉NaN的值
df.fillna(value = 'Fill value')
將column 'A'中NaN的值換成column 'A'的平均值
df['A'].fillna(value = df['A'].mean())
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