Julia for Data Analysis

13 Advanced transformations of data frames

This chapter covers

• Performing advanced transformations of data frames and grouped data frames
• Chaining transformation operations to create data processing pipelines
• Sorting, joining, and reshaping data frames
• Working with categorical data
• Evaluating classification models

In chapter 12, you learned how to perform basic transformations of data frames by using operation specification syntax with the combine function. In this chapter, you will learn more advanced scenarios for using this syntax, along with more functions that accept it: select, select!, transform, transform!, subset, and subset!. With these functions, you can conveniently perform any operation you need on columns. At the same time, these ...