Calculate avg for the previous 3 month and apply

[Fragmaticx]

Hi 

I'm working on a model. And I want to calculate Average Cost Per Parcel (for the preivous 3 month), with data.

And Apply that to Parcels Sales (EST)

And it seems like it working, or atleast i calculate a avg. But it does not apply to the 2 most recent months:

Market	Lastmile Amount Cost	Estimated Lastmile Cost	Parcels Cost	Parcels Sales (EST)	Avg Cost Per Parcel (Last 3 Months)	ShipPeriod
PT	1.375.489	1.360.924	60.817	60.173	22,62	202408
PT	1.458.816	1.439.754	64.514	63.671	22,61	202409
PT	1.757.429	1.732.260	77.784	76.670	22,59	202410
PT	1.954.116	1.918.556	84.681	83.140	23,08	202411
PT	2.569.072	2.532.680	111.612	110.031	23,02	202412
PT	1.710.249	1.679.592	72.633	71.331	23,55	202501
PT	1.495.076	1.477.836	62.441	61.721	23,94	202502
PT				60.341		202503
PT				182		202504

Avg Cost Per Parcel (Last 3 Months) = 
VAR AvailableMonths =
FILTER(
    VALUES('DateTable'[ShipPeriod]),
    NOT ISBLANK([Avg Cost Per Parcel]) && [Avg Cost Per Parcel] <> 0
)

VAR LastThreeMonthsWithData =
    TOPN(3, AvailableMonths, 'DateTable'[ShipPeriod], DESC)  -- Get the latest 3 months with data

VAR Result =
    CALCULATE(
        AVERAGEX(LastThreeMonthsWithData, [Avg Cost Per Parcel]),  -- Average only non-blank months
        'DateTable'[ShipPeriod] IN LastThreeMonthsWithData
    )

RETURN
    Result

Most of this is done by chatgpt, since i'm not that good at dax. So if there is something obvious im missing, please help me 🙂 


Thanks in advance,

[v-tsaipranay]

Hi @Fragmaticx ,

May I ask if you have resolved this issue? If so, please mark the helpful reply and accept it as the solution. This will be helpful for other community members who have similar problems to solve it faster.

Thank you.

[v-tsaipranay]

Hi @Fragmaticx ,

I wanted to check if you had the opportunity to review the information provided. Please feel free to contact us if you have any further questions. If my response has addressed your query, please accept it as a solution and give a 'Kudos' so other members can easily find it.

Thank you.

[v-tsaipranay · Accepted solution]

Hi @Fragmaticx ,

Thanks for reaching out to the Microsoft Fabric Community, and we appreciate @some_bih  valuable observation he is correctly highlighted that the issue may stem from how your DateTable is related to the fact table.

If the DateTable is not properly related using a valid date column (as opposed to ShipPeriod), time-based calculations like TOPN may not evaluate as expected. Additionally, your current DAX logic retrieves the last three months globally, not relative to each row context. This can result in the calculation not applying to recent months those months are excluded from the filtered data.

To address this, first ensure that the DateTable is correctly marked as a date table and is connected to the fact table using a proper date-type column. Next, verify that the [Avg Cost Per Parcel] measure is returning valid values for the months you are analyzing, particularly the most recent ones. Finally, consider updating your DAX logic to calculate a rolling 3-month average relative to each row’s period, rather than using a fixed set of the last three months globally.

If this post helps, then please give us Kudos and consider Accept it as a solution to help the other members find it more quickly.

Thankyou.

[v-tsaipranay]

Hi @Fragmaticx ,

I wanted to check if you had the opportunity to review the information provided. Please feel free to contact us if you have any further questions. If my response has addressed your query, please accept it as a solution and give a 'Kudos' so other members can easily find it.

Thank you.

[some_bih]

Hi @Fragmaticx your date table is connected with some date in fact table which is not 'DateTable'[ShipPeriod]?

Check relationship your date table date column with other tables.