INQUIRY: Powerquery Decreasing Value

[AntiquinaRyan]

Hello guys,

Good morning.

Apologies in advance for asking this basic question. I'm new to power query and googling did not offer much help when I tried to look for answers (probably due to the keywords I'm using).

I'm need help the following:

Considering I have a base value of 100 at the start of the month, I want to know how to have it implemented via powerquery like in the table below:

[lbendlin · Accepted solution]

I think it can be debated what came first, the attendance or the attrition.

Feel free to modify the code.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("XY7BCcAwDMR28TsQn+u07iwh+69RCi0BPSWOQ3NadfXwSGtmq70cP+sTBwbJwcDgBF/g4sGNgZyCkQoKViopmCl2iqGqLdYD", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t, Attrition = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Attrition", Int64.Type}, {"Date", type date}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Attendance", (k)=> 100 - (List.Sum(Table.SelectRows(#"Changed Type", each [Date]<=k[Date])[Attrition])??0),Int64.Type),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "Attrition %", each [Attrition]/([Attendance]+[Attrition]),type number)
in
    #"Added Custom1"

How to use this code: Create a new Blank Query. Click on "Advanced Editor". Replace the code in the window with the code provided here. Click "Done". Once you examined the code, replace the Source step with your own source.

[AntiquinaRyan]

Hello @lbendlin ,

Thank you very much for the response. I'll surely try this one out and the code structure makes sense by initially looking at it. To answer your question, attendance comes first before the attrition.