Filling In the Missing Values
Deleting missing values is not the only way to get rid of them. You can also replace all NaNs with a defined value, for instance, with the mean value of the column or with zeros. It can be useful in a lot of cases. You will learn this in the course Learning Statistics with Python.
Look at the example of filling missing values in the column 'Age' with the median value of this column:
1234import pandas as pd data = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/4bf24830-59ba-4418-969b-aaf8117d522e/titanic_2', index_col = 0) data['Age'].fillna(value=data['Age'].median(), inplace=True) print(data['Age'].isna().sum())
Explanation:
.fillna(value=data['Age'].median(), inplace=True)
value = data['Age'].median()- using the argumentvalue, we tell the.fillna()method what to do with theNaNvalues. In this case, we applied the.fillna()method to the column'Age'and replaced all missing values with the median of the column;inplace=True- the argument we can use for saving changes.
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One of the most common ways of filling missing values is replacing them with the mean value of the column. So, your task here is to replace the NaN values in the column 'Age' with the mean value of the column (using the inplace = True argument). Then output the sum of the missing value in the column 'Age'.
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Can you explain the difference between using the mean and the median to fill missing values?
What are some other strategies for handling missing data?
Can you show how to fill missing values in multiple columns at once?
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Deleting missing values is not the only way to get rid of them. You can also replace all NaNs with a defined value, for instance, with the mean value of the column or with zeros. It can be useful in a lot of cases. You will learn this in the course Learning Statistics with Python.
Look at the example of filling missing values in the column 'Age' with the median value of this column:
1234import pandas as pd data = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/4bf24830-59ba-4418-969b-aaf8117d522e/titanic_2', index_col = 0) data['Age'].fillna(value=data['Age'].median(), inplace=True) print(data['Age'].isna().sum())
Explanation:
.fillna(value=data['Age'].median(), inplace=True)
value = data['Age'].median()- using the argumentvalue, we tell the.fillna()method what to do with theNaNvalues. In this case, we applied the.fillna()method to the column'Age'and replaced all missing values with the median of the column;inplace=True- the argument we can use for saving changes.
Swipe to start coding
One of the most common ways of filling missing values is replacing them with the mean value of the column. So, your task here is to replace the NaN values in the column 'Age' with the mean value of the column (using the inplace = True argument). Then output the sum of the missing value in the column 'Age'.
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