Using PowerPivot in Excel 2013 - Business Intelligence in Microsoft SharePoint 2013 - page 112

FIGURE 4-19 To enable PowerPivot 2013, click the Options tab in the Backstage view of Excel 2013.
In the Excel Options dialog box that opens, click Add-Ins. In the Manage drop-down list, select
COM Add-Ins and click Go, as shown in Figure 4-20.
In the COM Add-Ins dialog box, select the check box labeled Microsoft Office PowerPivot for
Excel 2013, as depicted in Figure 4-21.
In PowerPivot for Excel 2013, you can create calculated fields. . In previous versions of PowerPivot,
you created measures . Practically speaking, they're the same thing. Excel used the term calculated
fields long before PowerPivot even existed, and measures is a term from multidimensional databases.
The change in the name makes sense for Excel users.