Introduction

In the previous chapter, we looked at some of the main techniques that are used in data analysis. We saw how hypothesis testing can be used when analyzing data, we got a brief introduction to visualizations, and finally, we explored some concepts related to time series analysis. In this chapter, we will elaborate on some of the topics we've already looked at (such as plotting and hypothesis testing) while introducing new ones coming from probability theory and data transformations.

Nowadays, work relationships are becoming more and more trust-oriented, and conservative contracts (in which working time is strictly monitored) are being replaced with more agile ones in which the employee themselves is responsible for accounting working time. This liberty may lead to unregulated absenteeism and may reflect poorly on an employee's candidature, even if absent hours can be accounted for with genuine reasons. This can significantly undermine healthy working relationships...