Finding monthly $ variance on TotalMTD: full months vs. current month, in a same table

[ebeauchamp]

Hi,
In this topic:
https://carldesouza.com/total-month-to-date-totalmtd-totalqtd-totalytd-datesmtd-power-bi/

There is a description of how this measure:

MTD = TOTALMTD(SUM(Orders[Amount]), Dates[Date], FILTER(Dates, Dates[Date] < TODAY()))

Can be used to have the previous months showing the full amounts, and the current month showing the MTD up to yesterday, as per this screenshot:

The challenge I have is to calculate the proper monthly $ variances from such a table. For all the complete months, this is basically using [MTD]-[PMTD]. However, for the current month, the calculation should compare the MTD up to yesterday, with the PMTD of the same day, a month ago, to see how much we increased vs. the same day last month, eg on the same period.  And the results should all be in the same column, in order to create the proper visuals.

Tried many measures to achieve this but having no luck so far. Any ideas?

Thanks in advance for your help!
Erik 

[ebeauchamp · Accepted solution]

Thanks for the suggestions. After reviewing them and reading many more posts, the following solution worked:
Step 1. In the Transactions table, added this calculated column:

IsCurrentMonth =

IF (

YEAR(Transactions[Date]) = YEAR(TODAY())

&& MONTH(Transactions[Date]) = MONTH(TODAY()),

"Yes",

"No"

)

Step 2. Created a measure using the "Values" function, which uses the step 1 column as a condition, in order to "assign" one of the two measures: MoM for completed months, and MTD for the current month.

VarianceMoM&MTD = IF(VALUES(Transactions[IsCurrentMonth])="No",[Amounts$MoM$],[MTDVar$])

Result: this new measure uses the Mom measure for past months, and the MTD measure for the current one. Glad to have discovered this "Values" function since it allows to build a measure tapping into the table columns, without needing to do a calculation first (sum etc). 

[Anonymous]

MTD := 
	calculate(
		[Total Amount],
		Dates[Date] < TODAY(),
		DATESMTD( Dates[Date] )
	)

PYMTD :=
var __effectiveDates =
	CALCULATETABLE(
		VALUES( Dates[Date] ),
		KEEPFILTERS( Dates[Date] < TODAY() )
	)
return
	calculate(
		[MTD],
		SAMEPERIODLASTYEAR( __effectiveDates )
	)

Best

D

[Greg_Deckler]

Time intelligence functions are really just syntax sugar for FILTER. If you want explicit control over your date filters, see if my Time Intelligence the Hard Way provides a different way of accomplishing what you are going for.

https://community.powerbi.com/t5/Quick-Measures-Gallery/Time-Intelligence-quot-The-Hard-Way-quot-TIT...