Categorizing Consecutive Months With Zero Values Into Buckets - excel

Question

I've constructed a data model around utilization for my company's fleet within PowerQuery. We have a number of different columns in the data model. Specifically, mileage, VIN, start date, and end date (see below for example table).
Mileage | VIN | Start Date | End Date |
0 | 123 | 6/1/18 | 6/30/18 |
0 | 123 | 7/1/18 | 7/31/18 |
0 | 123 | 8/1/18 | 8/31/18 |
0 | 123 | 9/1/18 | 9/30/18 |
0 | 123 | 10/1/18 | 10/31/18 |
What I'm trying to accomplish is if mileage is equal to 0 for one month it is categorized into a bucket labeled 0-30 days, if mileage is equal to 0 for two consecutive months it is categorized as 31-60 days, and 0 mileage for more than 3 consecutive months would be categorized as >60 days. From the example above, this vehicle would be categorized in the ">60 days" bucket. Is there an easy way to do this within the data model using DAX? Please let me know if you have any follow up questions. Thank you!

Answer 1

Try this as a Calculated Column:
Buckets =
VAR rowDate = 'myTable'[ Start Date ]
VAR previousDate =
CALCULATE (
MAX ( 'myTable'[ Start Date ] ),
FILTER (
ALLEXCEPT ( myTable, myTable[ VIN ] ),
'myTable'[ Start Date ] < rowDate
)
)
VAR prePreviousDate =
CALCULATE (
MAX ( 'myTable'[ Start Date ] ),
FILTER (
ALLEXCEPT ( myTable, myTable[ VIN ] ),
'myTable'[ Start Date ] < previousDate
)
)
VAR PreviousMileage =
CALCULATE (
MAX ( 'myTable'[Mileage ] ),
ALLEXCEPT ( 'myTable', 'myTable'[ VIN ] ),
'myTable'[ Start Date ] = previousDate
)
VAR PrePreviousMileage =
CALCULATE (
MAX ( 'myTable'[Mileage ] ),
ALLEXCEPT ( 'myTable', 'myTable'[ VIN ] ),
'myTable'[ Start Date ] = prePreviousDate
)
RETURN
SWITCH (
TRUE (),
'myTable'[Mileage ] + IF ( ISBLANK ( PreviousMileage ), 1, PreviousMileage )
+ IF ( ISBLANK ( PrePreviousMileage ), 1, PrePreviousMileage )
= 0, "> 60 Days",
'myTable'[Mileage ] + IF ( ISBLANK ( PreviousMileage ), 1, PreviousMileage )
= 0, "31 to 60 Days",
'myTable'[Mileage ] = 0, "0 to 30 Days",
"No Days"
)
The result looks like this. I added some values for testing.