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  3. HR Analytics: Predicting Employee Churn in Python

Exercise

Computing Gini index

The decision tree algorithm aims to achieve partitions in the terminal nodes that are as pure as possible. The Gini index is one of the methods used to achieve this. It is calculated based on the proportion of samples in each group.

Given the number of people who stayed and left respectively, calculate the Gini index for that node.

Instructions

100 XP
  • Calculate the total number of employees in that node.
  • Compute the Gini index based on proportion of employees in each group.