New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 665th installment in their series of digital spreadsheet magic tricks, you'll learn how to use the AGGREGATE function to make calculations on filtered data. The SUBTOTAL function only has 11 functions, whereas the AGGREGATE has 19 plus options to ignore errors, hidden rows and nested SUBTOTAL or AGGREGATE functions.