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Stemar_Aubert's avatar
Stemar_Aubert
Resolver I
6 years ago
Solved

Weighted averages in Power Query

Hi,

 

I have a set of data as follow.

LocalStringUnitsValueSum
America2510250
Australia350150
America89201780

 

And so on.

 

Before, I would group and take the average value. But the introduction of Units means I need a variant of Sumproduct() formula.

 

Is there a way, using PowerQuery only, to perform the following operation ?

 

For each America = (250+1780)/(25+89)

 

Thanks

Need Help
  • Anonymous's avatar
    Anonymous
    6 years ago

    The code below should do the trick. Just adapt your List.Average to List.Sum([Sum])/List.Sum([Units]).

     

    = Table.Group(Source, {"LocalString"}, {{"Sum", each List.Sum([Sum])/List.Sum([Units]), type number}})

     

3 Replies

  • Anonymous's avatar
    Anonymous
    Not applicable
    6 years ago

    The code below should do the trick. Just adapt your List.Average to List.Sum([Sum])/List.Sum([Units]).

     

    = Table.Group(Source, {"LocalString"}, {{"Sum", each List.Sum([Sum])/List.Sum([Units]), type number}})

     

  • dax's avatar
    dax
    Community Support
    6 years ago

    Hi Sauber,

    You could try below M code to see whether it work or not

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WcsxNLcpMTlTSUTIyBRKGBmCWgVKsDlCutLikKDEnEyRrDMSmIElDmCRco4UlSA9YztwCKBkLAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [LocalString = _t, Units = _t, Value = _t, Sum = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"LocalString", type text}, {"Units", Int64.Type}, {"Value", Int64.Type}, {"Sum", Int64.Type}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"LocalString"}, {{"total  sum ", each List.Sum([Sum]), type number}, {"total unit", each List.Sum([Units]), type number}, {"all", each _, type table [LocalString=text, Units=number, Value=number, Sum=number]}}),
    #"Added Custom" = Table.AddColumn(#"Grouped Rows", "Custom", each [#"total  sum "]/[total unit]),
    #"Expanded all" = Table.ExpandTableColumn(#"Added Custom", "all", {"Units", "Value", "Sum"}, {"all.Units", "all.Value", "all.Sum"}),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded all",{"total  sum ", "total unit"})
in
    #"Removed Columns"

    Best Regards,
    Zoe Zhi

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