Excel Forum

Excel Magic Trick 620: Count Unique Items in List - Robust Formulas & A Few Array Formula Tricks

Aladin at the Mr Excel Message Board has great advice about the robustness of formulas. Learn about a robust formula for counting unique items in a list using the SUMPRODUCT, COUNTIF and an array formula component, then see an array formula that uses SUM, IF, FREQUENCY, MATCH and ROWS functions.

Learn about array formula tricks that involve: Ampersand Blank, Ampersand Tilda, IF function logical_test argument can accept any non-zero number as true and more!

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