topic Re: Rolling average with variable measure in DAX Commands and Tips

Rolling average with variable measure

hvanstalle — Sat, 17 Oct 2020 09:49:04 GMT

Hello,

I created a Rolling average on our efficiency measurement and it works fine:

CALCULATE(IF([Efficiency (%)]<>BLANK(),

AVERAGEX(

DATESBETWEEN(

Datetable_months[Datum],

DATEADD(varDate, -12, MONTH),

DATEADD(varDate, 0, MONTH)

CALCULATE([Efficiency (%)])

)

But as I wanted to make this more flexible and also easy to switch between some other KPI measures I created the possibility to choose between the KPI they want. But now my rolling average isn't working anymore. Any idea why? It gives me the correct item, but without the average.

12MRol =

VAR varDate = LASTDATE(Datetable_months[Datum])

VAR varItem =

SWITCH(

SELECTEDVALUE(Selection[Item]),

"Efficiency (%)", [Efficiency (%)],

"Home load rate (%)", [Home load rate (%)],

"Load factor (%)",[Load factor (%)],

"Use factor (%)",[Use factor (%)],

"Time use factor (%)", [Time use factor (%)])

Return

CALCULATE(IF(varItem<>BLANK(),

AVERAGEX(

DATESBETWEEN(

Datetable_months[Datum],

DATEADD(varDate, -12, MONTH),

DATEADD(varDate, 0, MONTH)

CALCULATE(varItem)

)

))

Thanks in advance!

Re: Rolling average with variable measure

daxer-almighty — Sat, 17 Oct 2020 13:46:50 GMT

Please try to understand how variables in DAX work. Since DAX is a functional language, variables are really... CONSTANT. Once you've grabbed their values, they will never change throughout the execution of the code. So, doing calculate(varItem) = varitem. Always. There is no change here. By the way, a measure is always implicitly wrapped in CALCULATE, so doing this CALCULATE( [Measure] ) is the same as just calling the measure itself.

Re: Rolling average with variable measure

hvanstalle — Sat, 17 Oct 2020 14:26:01 GMT

Ok, thanks for your feedback.