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Anonymous
Not applicable

Measure Difference When Value = Value - 1

I have a measure, CRT, that is being displayed over an interval of every 30 minutes time. to make things easier I've attached an interval ID number that represents every 30 minutes of the day. 

 

I'm trying to measure the difference between the measure 30 minutes ago compared to the current time. I am coming up short. Currently I have the below attempt in DAX

CRT Difference =
VAR PrevCRT =
CALCULATE(IntraCRT[CRT],
FILTER(DAXIntervalID,
    DAXIntervalID[Value] = DAXIntervalID[Value] -1)
)
VAR CurrentCRT = IntraCRT[CRT]
RETURN
    PrevCRT - CurrentCRT
 
The outcome I receive for PrevCRT is blanks vs the CRT from 30 minutes prior. 
3 REPLIES 3
Anonymous
Not applicable

Thank you so much for the quick reply. 

 

Unfortunately that's giving me the same result.

 

JRoot213_0-1679625269949.png

 

CRT Difference =
VAR PrevCRT =
CALCULATE(IntraCRT[CRT],
FILTER(ALL(DAXIntervalID[Value]),
    DAXIntervalID[Value] = MAX(DAXIntervalID[Value]) -1)
)
VAR CurrentCRT = IntraCRT[CRT]
RETURN
    PrevCRT - CurrentCRT
wdx223_Daniel
Super User
Super User

CRT Difference =
VAR PrevCRT =
CALCULATE(IntraCRT[CRT],
FILTER(ALL(DAXIntervalID[Value]),
    DAXIntervalID[Value] = DAXIntervalID[Value] -1)
)
VAR CurrentCRT = IntraCRT[CRT]
RETURN
    PrevCRT - CurrentCRT

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