As you learned in Chapter 6, “Entering Excel Data,” to get to the real meat of a spreadsheet model, you need to expand your formula repertoire to include Excel’s worksheet functions. Several hundred of these functions exist, and they’re an essential part of making your worksheet work easier and more powerfully. Excel has various function categories, including the following:
• Date and time
• Lookup and reference
• Math and trigonometry
(Note that this list, as well as the sections that follow, are presented in the order that the function category buttons appear in Excel’s Insert Function dialog box.) ...