I might be alone in this, but I hate seeing hyphens in lieu of 0′s in tables and charts. Here’s what it looks like:
To change these dashes to 0′s select either the column or axis and press Ctrl/Command-1 to open formatting options. The formula, if you will follows this structure:
Positive; Negative; Zero; Text
So just look for “-”?? after the second semicolon and change it to a 0. Easy peezy!
You can learn more about custom number formatting from the Microsoft site.