Challenge: Detect Outliers with IQR
Detecting outliers is a crucial part of data cleaning, as these extreme values can distort your analysis and lead to misleading conclusions. One common and robust approach for identifying outliers in a numerical column is the interquartile range (IQR) method. This method is especially useful because it is not affected by extreme values, unlike methods based on the mean and standard deviation.
The IQR method works by first calculating the first quartile (Q1) and the third quartile (Q3) of the data. Q1 is the value below which 25% of the data fall, and Q3 is the value below which 75% of the data fall. The IQR itself is simply Q3 minus Q1, representing the range of the middle 50% of your data.
Once you have the IQR, you can define the lower and upper bounds for typical values in your dataset. Any data point that falls below Q1 minus 1.5 times the IQR, or above Q3 plus 1.5 times the IQR, is considered an outlier. This rule is widely used because it provides a balance between sensitivity and robustness.
12345678910import pandas as pd # Create a DataFrame with a numerical column containing some outliers data = { "score": [10, 12, 13, 14, 15, 16, 17, 18, 100, 110] } df = pd.DataFrame(data) print("Original DataFrame:") print(df)
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Write a function that returns a boolean Series indicating which values in a numerical pandas Series are outliers based on the interquartile range (IQR) method.
- Calculate the first quartile (Q1) and third quartile (Q3) of the Series.
- Compute the IQR as the difference between Q3 and Q1.
- Determine the lower and upper bounds using 1.5 times the IQR below Q1 and above Q3, respectively.
- Return a boolean Series where
Trueindicates that the corresponding value in the original Series is an outlier.
Solução
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Detecting outliers is a crucial part of data cleaning, as these extreme values can distort your analysis and lead to misleading conclusions. One common and robust approach for identifying outliers in a numerical column is the interquartile range (IQR) method. This method is especially useful because it is not affected by extreme values, unlike methods based on the mean and standard deviation.
The IQR method works by first calculating the first quartile (Q1) and the third quartile (Q3) of the data. Q1 is the value below which 25% of the data fall, and Q3 is the value below which 75% of the data fall. The IQR itself is simply Q3 minus Q1, representing the range of the middle 50% of your data.
Once you have the IQR, you can define the lower and upper bounds for typical values in your dataset. Any data point that falls below Q1 minus 1.5 times the IQR, or above Q3 plus 1.5 times the IQR, is considered an outlier. This rule is widely used because it provides a balance between sensitivity and robustness.
12345678910import pandas as pd # Create a DataFrame with a numerical column containing some outliers data = { "score": [10, 12, 13, 14, 15, 16, 17, 18, 100, 110] } df = pd.DataFrame(data) print("Original DataFrame:") print(df)
Swipe to start coding
Write a function that returns a boolean Series indicating which values in a numerical pandas Series are outliers based on the interquartile range (IQR) method.
- Calculate the first quartile (Q1) and third quartile (Q3) of the Series.
- Compute the IQR as the difference between Q3 and Q1.
- Determine the lower and upper bounds using 1.5 times the IQR below Q1 and above Q3, respectively.
- Return a boolean Series where
Trueindicates that the corresponding value in the original Series is an outlier.
Solução
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