How to count the unique values for a given conidtion

[aj_954]

Hi

I have a following example data:

Label T/F

A          T

A          T

A          T

B          F

B          F

C          T

C         T

I want to write a expression for a KSI that shows the *unique* times a the variable "label" gets assigned true. So in this example, it would be 2.

[aj_954 · Accepted solution]

easy solution:

Count({1<Label={'TRUE'}>} distinct Label)