counting unique values from list with specific criteria

[derekjames]

Hello. I'm trying to write a formula that will count the number of unique values in column B IF value in C equals a specific value in column A. I have a formula to count the unique values in column B =SUMPRODUCT((B3:B13<>"")/COUNTIF(B3:B13,B3:B13&"")) but am having a hard time attaching a =sum(if( prior to the sumproduct formula. I have attached a spreedsheet with my data set to help. What i want to write is "if (A3:A13) = C1, then count unique values in (B3:B13)"

Thanks!

[Haseeb Avarakkan]

Use this ARRAY FORMULA, must hit CTRL+SHIFT+ENTER, rather than just ENTER.

=SUM(SIGN(FREQUENCY(IF(A$3:A$25=C3,IF(B$3:B$25<>"",MATCH(B$3:B$25,B$3:B$25,0))),ROW(B$3:B$25)-ROW(B$3)+1)))

Adjust the ranges.

[derekjames]

Thanks so much! I'm not even gonna try to understand the formula. Just glad it works!