1 Exploratory data analysis

  1.1 Introduction

  1.2 The basics of EDA

  1.3 The stem-and-leaf diagram

  1.4 Drawing a stem-and-leaf diagram

  1.5 The box-and-whisker diagram

2 Outliers

  2.1 Criteria for rejecting outliers

3 Skewness, gaps and multiple peaks

  3.1 Skewness

  3.2 Gaps and multiple peaks

  3.3 Final comments on data representations