Excel 2007: The Missing Manual

Chapter 13. Advanced Formula Writing and Troubleshooting

Over the last five chapters you’ve learned how to use Excel’s impressive function toolkit to calculate everything from statistical trend lines to a payment schedule for a home mortgage. Now that you’ve had a close look at these functions, it’s time to consider a few techniques to help you get the most from your formulas.

In this chapter, you’ll tackle four new topics that deal with writing advanced formulas:

• How to use conditional logic with functions like SUMIF( ) and COUNTIF( ).

• How to make formulas more readable by using named ranges.

• How to control when Excel recalculates your worksheets.

• How to solve mysterious errors by using Excel’s formula auditing tools.

Conditions in Formulas

Chapter 8 gave you a first look at how to use conditional logic when writing Excel formulas. The basic principles are easy: you construct a condition using the logical operators like <, >, =, and <>, and then use this condition with a conditional function. So far, you’ve considered only one conditional function—IF( )—which performs different actions depending on the result of a calculation.

The following formula carries out the operation in either the second or third argument, depending on the value of cell A20:

	=IF(A20>10000, A20*5%, A20*3%)

Translation: For values greater than 10,000, Excel executes the formula A20*5%; otherwise, it carries out the second formula. If A20 contains the dollar amount of a sales invoice, you can use this formula to determine ...