Calculate Age of spare part between failures

[KvO88]

I want to know the lifetime of a spare part based on dates in different rows. Example: the age of the spare part after first replacement will be "date of replacement - installation date". When that same part is replaced again on the same system, I want to calculate the age since the replacement "date of 2nd replacement-date of 1st replacement" and so on. 

See below a simplified example of a table containing the replacements of a single spare part:

Unique System ID	Spare Part ID	System Install Date	Part Replacement Date	Age of part?
1	5330 018	01-Jan-2023	01-Feb-2023
2	5330 018	23-Feb-2023	05-Apr-2023
3	5330 018	04-Mar-2023	08-Aug-2023
4	5330 018	12-May-2023	3-Sep-2023
1	5330 018	01-Jan-2023	19-Nov-2023
2	5330 018	23-Feb-2023	18-Nov-2023
5	5330 018	17-Jul-2023	23-Nov-2023
1	5330 018	01-Jan-2023	01-Jan-2024
6	5330 018	05-Sep-2023	18-Jan-2024
3	5330 018	04-Mar-2023	5-Oct-2023

[Anonymous · Accepted solution]

Hi @KvO88 ,
I believe that @Greg_Deckler 's answer will be of great help to you and in the meantime I have created some data for you to help you and I hope that the combination of our answers will help you to solve your problem. You can follow the steps below:

1.Add a new column.

Age of Part = 
VAR _ID = 'Table'[Spare Part ID]
VAR _Date = 'Table'[Part Replacement Date]
RETURN
DATEDIFF(
    CALCULATE(
        MAX('Table'[Part Replacement Date]),
        FILTER(
            'Table',
            'Table'[Spare Part ID] = _ID
            && 'Table'[Part Replacement Date] < _Date
        )
    ),
    _Date,
    DAY
)

Final output:

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Ada Wang

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[KvO88]

Hi @Anonymous ,

This still does not calculate the age of the part until the first time it was replaced, so the datediff install date, first time replaced. Do you know how I can integrate that in this approach?

[Greg_Deckler]

@KvO88 See my article on Mean Time Between Failure (MTBF) which uses EARLIER: http://community.powerbi.com/t5/Community-Blog/Mean-Time-Between-Failure-MTBF-and-Power-BI/ba-p/3395....
The basic pattern is:
Column = 
  VAR __Current = [Value]
  VAR __PreviousDate = MAXX(FILTER('Table','Table'[Date] < EARLIER('Table'[Date])),[Date])

  VAR __Previous = MAXX(FILTER('Table',[Date]=__PreviousDate),[Value])
RETURN
 ( __Current - __Previous ) * 1.

[KvO88]

Hi @Greg_Deckler,

Thank you, I did find your article very helpful. There is one thing that I am struggeling with, what I cannot get right is that the first meantime between failure should be the date a first time a repair was needed minus (-) the installation date. That is currently not in the "Uptime" calculation if I am correct.  

Can you help me a little further with that?