Introduction

In any visualization, a virtual table is created based on the dimensions used in the view. This is added to the Columns, Rows, and Marks shelves.

Figure 8.1: Virtual table in the view

The highlighted area in the preceding figure consisting of the Rows, Columns, and Marks shelves will make up your level of detail. The empty canvas outline for dropping fields contains the virtual table that will be affected by table calculations.

A table calculation is simply a calculation that computes results based on the table segment in scope. You will learn about segments and scope in detail in the following sections. For now, assume it is the entire empty canvas area. All table calculations will only be computed within the empty canvas outline or the virtual table.

In previous chapters, you learned about visualization methods that present data in a meaningful way. There may be times where you need to analyze a table, such as when you want to find the...