When You Are Looking for a Range Not an Exact Value, a Grade Not a Score. Binning the data can be a very useful strategy while dealing with numeric data to understand certain trends.
Binning the data can be a very useful strategy while dealing with numeric data to understand certain trends. Sometimes, we may need an age range, not the exact age, a profit margin not profit, a grade not a score. The Binning of data is very helpful to address those. Pandas library has two useful functions cut and qcut for data binding. But sometimes they can be confusing. In this article, I will try to explain the use of both in detail.
To understand the concept of binning, we may refer to a histogram. I am going to use a student performance dataset for this tutorial. Please feel free to download the dataset from this link:
Import the necessary packages and the dataset now.
import pandas as pd import numpy as np import seaborn as snsdf = pd.read_csv('StudentsPerformance.csv')
Using the dataset above, make a histogram of the math score data:
We did not mention any number of bins here but behind the scene, there was a binning operation. Math scores have been divided into 10 bins like 20–30, 30–40. There are many scenarios where we need to define the bins discretely and use them in the data analysis.
This function tries to divide the data into equal-sized bins. The bins are defined using percentiles, based on the distribution and not on the actual numeric edges of the bins. So, you may expect the exact equal-sized bins in simple data like this one
In this example, we just gave a range from 0 to 99 and asked the qcut function to divide it into 4 equal bins. It made 4 equal bins of 25 elements each. But when the data is bigger and the distribution is a bit complex, the value_counts in each bin may not be equal as the bins are defined using the percentiles.
Here are some example use cases of qcut:
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