R help - Sep 2015 - R help - "UCL at different levels"

Hello Experts,

I need your help to understand the how can we calculate the UCL values at
different levels dynamically?

Customer No       Month       Sales          UCL 100 201501 500 550.75 100
201502 100 550.75 101 201501 400 425.25 101 201502 50 425.25
In the above scenario i need calculate UCL at Customer level.

Any help is appreciated.

Thanks,
Abrar

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