#3 . 3.3 feature improvement pg43

[AndrewDavidRatnam]

arbitrary_imputer = SimpleImputer(strategy='constant', fill_value=999)
arbitrary_imputer.fit_transform(covid_flu[numerical_features])

NameError: name 'numerical_features' is not defined

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FIX:

arbitrary_imputer = SimpleImputer(strategy='constant', fill_value=999)
arbitrary_imputer.fit_transform(covid_flu[numerical_columns])