How to get the sum of two variables being subtracted

[gmoney2594]

Hello,

I am currently trying to get the sum of two variables being subtracted from one another. My expression looks like this:

Sum(
aggr(
Count({<[Year]={'2018'},[Project Type]={'IT'}>} [Computer Type]),
-
Count({<[Year]={'2019'},[Project Type]={'IT'}>} [Computer Type])

))

I am getting 0 for the answer but what I want is the difference  between the 2 numbers.

[JGMDataAnalysis]

I don't understand why you are using the Aggr function in your expression...
Maybe something like this?

Count({<[Year] = {2018}, [Project Type] = {IT}>} [Computer Type])
- 
Count({<[Year] = {2019}, [Project Type] = {IT}>} [Computer Type])

[gmoney2594 · Accepted solution]

So I want to get the sum of the difference to show.

i.e.   30 - 20 = 10

Then show 10 in the chart