Percentage of change with 2 data slicers in Power BI - powerbi

Question

I have a scenario with two data slicers. The first data slicer filters data for one period, the second one for another period. By editing visual interactions I got this works at the same page.
Now I want to compare two resulting values (in this case, number of transactions, and find a percentage of change between two selected periods.
I duplicated data column so I have two date columns for each slicer and I calculated the next measures:
# of Transactions 1 = CALCULATE(COUNT(Report[ProductID]),DATESBETWEEN(Report[Date1],[Start Date 1],[Last Date 1]))
# of Transactions 2 = CALCULATE(COUNT(Report[ProductID]),DATESBETWEEN(Report[Date2],[Start Date 2],[Last Date 2]))
% Transaction Change = ([# of Transactions 1]/[# of Transactions 2]) - 1
The first 2 measures are accurate (# of Transactions 1 & 2), but % of change doesn't work.
If you look at the screenshot below, you'll see # od Transactions 1 = 1,990 and # of Transactions 2 = 2,787. I want to compare this 2 values now.
How can I solve this?
Thank you.

Answer 1

First create two measure for your date bounds:
Min Date :=
MIN ( 'Report'[Date] )
Max Date :=
MAX ( 'Report'[Date] )
Then create a date table using the following DAX, this will join to you 'Report' table on the primary date:
Dates :=
VAR MinDate = [Min Date]
VAR MaxDate = [Max Date]
VAR BaseCalendar =
CALENDAR ( MinDate, MaxDate )
RETURN
GENERATE (
BaseCalendar,
VAR BaseDate = [Date]
VAR YearDate =
YEAR ( BaseDate )
VAR MonthNumber =
MONTH ( BaseDate )
VAR YrMonth =
100 * YEAR ( BaseDate )
+ MONTH ( BaseDate )
VAR Qtr =
CONCATENATE ( "Q", CEILING ( MONTH ( BaseDate ) / 3, 1 ) )
VAR YrMonthQtr =
100 * YEAR ( BaseDate )
+ MONTH ( BaseDate )
& CONCATENATE ( "Q", CEILING ( MONTH ( BaseDate ) / 3, 1 ) )
VAR YrMonthQtrDay =
100 * YEAR ( BaseDate )
+ MONTH ( BaseDate )
& CONCATENATE ( "Q", CEILING ( MONTH ( BaseDate ) / 3, 1 ) )
& DAY ( BaseDate )
RETURN
ROW (
"Day", BaseDate,
"Year", YearDate,
"Month Number", MonthNumber,
"Month", FORMAT ( BaseDate, "mmmm" ),
"Year Month", FORMAT ( BaseDate, "mmm yy" ),
"YrMonth", YrMonth,
"Qtr", Qtr,
"YrMonthQtr", YrMonthQtr,
"YrMonthQtrday", YrMonthQtrDay
)
)
Now create another date table from which to compare, and join to your primary date table in 'Report' and ensure the relationship is inactive:
Compare Dates :=
ALLNOBLANKROW ( 'Dates' )
Now create the [# of transaction] measure; one for 'Dates' and another for 'Compare Dates' like so:
[# of Transaction 1] :=
CALCULATE (
COUNT ( Report[ProductID] )
)
[# of Transaction 2] :=
CALCULATE (
[# of transaction 1],
ALL ( 'Dates' ),
USERELATIONSHIP ( 'Compare Dates'[Date], 'Report'[Date] )
)
Now Create the % Delta measure:
Transaction Change := CALCULATE(DIVIDE([# of Transactions 1],[# of Transactions 2]) - 1)
This should work like a charm and will work for any dates selected in your slicers, you will still need to associate your date slicers with your new date tables.
I hope this helps!!