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Calculate rolling average in power query|Power Query|Excel Forum|My Online Training Hub

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sp_CrumbsHome HomeExcel ForumPower Query Calculate rolling average in power…
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Calculate rolling average in power query
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AndyC
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May 24, 2023 - 11:48 pm
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Could someone please explain how to calculate a rolling average for a column of numbers in power query.
I think I need to add an index column and use this with list.average in a custom column but I can't work out the correct syntax.
I've looked online but all the examples I've found seem to be for Power BI and I'm using Excel.

Thanks

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Philip Treacy
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May 25, 2023 - 9:48 am
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Hi Andy,

There are a few ways to do it but the easiest would be to add an Index column starting from 1, then use List.FirstN to get the items in the column up to the current row, sum them, and divide by the row number (given by the Index column)

List.Sum(List.FirstN(#"Changed Type"[Value],[Index]))/[Index]

rolling average in power queryImage Enlarger

See attached file for example

Regards

Phil

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AndyC
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May 25, 2023 - 5:41 pm
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Thanks Phil,

That makes sense.

I realise now though that I haven't asked my question correctly!

Maybe what I'm after is correctly called a moving average of a specified number of values.

Please see my attached file as an example.

Here, the first 4 rows are averaged, then rows 2,3,4,5 are averaged, then rows 3,4,5,6 and so on.

I'd like to know how to do this in power query.

My apologies for not making this clear.

Regards,

Andy

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Riny van Eekelen
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See attached!

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AndyC
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May 25, 2023 - 6:44 pm
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Nice one Riny!

Thanks,

Andy

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