R : Cumulative (expanding window) mean by group with duplicate check for each calculation

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R : Cumulative (expanding window) mean by group with duplicate check for each calculation
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Next, enter the letters 'awesome' on your keyboard.
It will change your youtube progress bar into a flashing rainbow.

A brief introduction of myself,
Hi, my name is Delphi, nice to meet you.
I am here to help you get the answers you are seeking.
R : Cumulative (expanding window) mean by group with duplicate check for each calculation
Don't hesitate to leave a comment or start a chat if you have a more specific question.
Please feel free to leave a comment below if you have an answer or insights on the answer.
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(expanding for each duplicate with R calculation : Cumulative by mean group check window)