Forum Discussion
Reference previous row to get value
Hi all,
I have a dataset with Vehicles, Dates, and Odometer. I'm trying to create a calculation that returns the prior odometer reading for each row. I have followed several examples on the web and they work for the most part, but my issue is that I have some bad data where the odometer readings are incorrect and therefore not incremental (i.e. for 4/1/17 it may read 23,500 and then for 4/5/17 it may read 22,500).
The formula I've been working on looks like this:
Previous Odometer := CALCULATE(MAX(Transactions[Odometer #]),ALL(Transactions),Transactions[Vehicle #] = EARLIER(Transactions[Vehicle #]),Transactions[Transaction Date] < EARLIER(Transactions[Transaction Date]) )
What happens in the scenario where the odometer has a bad reading is that it keeps using that value for all future readings, and throws off the calculations from that point forward.
Example:
Transaction Date Odometer# Previous Odometer
02/08/17 66770 66320
02/15/17 97315 (bad data) 66770
02/20/17 67630 97315
02/27/17 68056 97315 <-- here is my issue. this should read 67630. Value keeps repeating for all rows below after this
03/04/17 68483 97315
Any suggestions on how I need to modify my DAX formula so that I don't get the same value being repeated?
I was able to get something to work by creating a Row ID using RANKX, and then another column (Prior Row ID) using EARLIER to get the previous Row ID. I then added this to my original Previous Odometer calculation as an additional filter:
Row ID := RANKX( ALL(Transactions[Transaction Date]), T ransactions[Transaction Date], , ASC, Dense)
Previous Row ID := CALCULATE
(
MAX(Transactions[Row ID]),
ALL(Transactions),Transactions[Vehicle #] = EARLIER(Transactions[Vehicle #]),
Transactions[Transaction Date] < EARLIER(Transactions[Transaction Date])
)
Previous Odoometer =
CALCULATE(MAX(Transactions[Odometer #]),
ALL(Transactions),
Transactions[Vehicle #] = EARLIER(Transactions[Vehicle #]),
Transactions[Transaction Date] < EARLIER(Transactions[Transaction Date]),
Transactions[Row ID] = EARLIER(Transactions[Previous Row ID]) )
)Curious to see if there is a much simpler way to achieve the same results....
12 Replies
I was able to get something to work by creating a Row ID using RANKX, and then another column (Prior Row ID) using EARLIER to get the previous Row ID. I then added this to my original Previous Odometer calculation as an additional filter:
Row ID := RANKX( ALL(Transactions[Transaction Date]), T ransactions[Transaction Date], , ASC, Dense)
Previous Row ID := CALCULATE
(
MAX(Transactions[Row ID]),
ALL(Transactions),Transactions[Vehicle #] = EARLIER(Transactions[Vehicle #]),
Transactions[Transaction Date] < EARLIER(Transactions[Transaction Date])
)
Previous Odoometer =
CALCULATE(MAX(Transactions[Odometer #]),
ALL(Transactions),
Transactions[Vehicle #] = EARLIER(Transactions[Vehicle #]),
Transactions[Transaction Date] < EARLIER(Transactions[Transaction Date]),
Transactions[Row ID] = EARLIER(Transactions[Previous Row ID]) )
)Curious to see if there is a much simpler way to achieve the same results....
Hello vrocca
I need to find the previous record to get the difference between the time.
My problem is that I can't use calculated columns, I only can use measures to solve this problem.
Can I find out the solution only with measures?
thanks,
Diego Schneiders Lutckmeier
Hey Diego - what is the reason as to why you are not able to create a calculated column? Are you connecting to a live cube? Could you create the calculated columns in the source?
vrocca wrote:Hi all,
I have a dataset with Vehicles, Dates, and Odometer. I'm trying to create a calculation that returns the prior odometer reading for each row. I have followed several examples on the web and they work for the most part, but my issue is that I have some bad data where the odometer readings are incorrect and therefore not incremental (i.e. for 4/1/17 it may read 23,500 and then for 4/5/17 it may read 22,500).
The formula I've been working on looks like this:
Previous Odometer := CALCULATE(MAX(Transactions[Odometer #]),ALL(Transactions),Transactions[Vehicle #] = EARLIER(Transactions[Vehicle #]),Transactions[Transaction Date] < EARLIER(Transactions[Transaction Date]) )
What happens in the scenario where the odometer has a bad reading is that it keeps using that value for all future readings, and throws off the calculations from that point forward.
Example:
Transaction Date Odometer# Previous Odometer
02/08/17 66770 66320
02/15/17 97315 (bad data) 66770
02/20/17 67630 97315
02/27/17 68056 97315 <-- here is my issue. this should read 67630. Value keeps repeating for all rows below after this
03/04/17 68483 97315
Any suggestions on how I need to modify my DAX formula so that I don't get the same value being repeated?
Hello All,I think my issue is the same with this but with a column with different data.
I want my RRA column to get the previous data of Data-Xi column based on Concatenate column data and blank the 1st data.
I hanve date field and Combine column of Mini Company and Machine.
i try different formula but error will show.
Below is my code:
RRA = (CALCULATE(MAX(Test[Data-Xi]),(DB[Concatenate]),FILTER(DB,DB[Entry Date/Time]<DB[Entry Date/Time])))
