Create measure calculating reduction/increase rate

[geogina85]

Good day.

Please help me calculate below in Power BI. I would like to calculate increase rate over time comparing the earliest month and the latest month, using the element Tested.

The calculation should in the end give me: Tested i.e  (32 sum of  Jan 2019 - 55 sum of July 2020) / 32 sum of Jan 2019 =72%. The data I have is as below:

Name	Element	Date	Value
Jumbo	Tested	1/1/2019	10
Jumbo	Diagnonised	1/1/2019	4
Monkey	Tested	1/7/2020	20
Monkey	Diagnonised	1/12/2020	5
Donkey	Tested	1/1/2019	8
Donkey	Diagnonised	1/1/2019	2
Donkey	Tested	1/7/2020	15
Donkey	Diagnonised	1/12/2020	6
Jumbo	Tested	1/1/2019	10
Jumbo	Diagnonised	1/1/2019	6
Monkey	Tested	1/7/2020	20
Monkey	Diagnonised	1/12/2020	5
Donkey	Tested	1/1/2020	4

I appreciate your help

[parry2k · Accepted solution]

@geogina85 add the following measures, you can always put all this in one measure but I created all these as separated measures:

Sum Value = SUM ( Diff[ Value] )

Sum First Date = 
VAR __firstDate = CALCULATE ( MIN ( Diff[ Date] ), ALLSELECTED ( Diff ) )
RETURN
CALCULATE ( [Sum Value], Diff[ Date] = __firstDate )

Sum Last Date = 
VAR __lastDate = CALCULATE ( MAX ( Diff[ Date] ), ALLSELECTED ( Diff ) )
RETURN
CALCULATE ( [Sum Value], Diff[ Date] = __lastDate )

% Diff = DIVIDE ( [Sum First Date] - [Sum Last Date], [Sum First Date] )

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[geogina85]

Great, I could solve my problem... Beyond thankful for this. @parry2k