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[Question #233018]: Weighted average

To: graphite-dev@xxxxxxxxxxxxxxxxxxx
From: Yaron <question233018@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 25 Jul 2013 16:41:37 -0000
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New question #233018 on Graphite:
https://answers.launchpad.net/graphite/+question/233018

Hi

I am using statsd to report aggregated metrics to graphite:

1/1/2000    metric1    12
2/1/2000    metric1    10

(each value is an average of metric1 in some period)

now when I want to calculate the average over all the period, I need to consider the number of events in each period (e.g a period with 10 events will affect the average more than one with three events). So I plan to report the number of events for this metrics separately and do a weighted average.

I expected that many people will need something like this but could not find too much online on this approach. Do I have a wrong requirement in some statistical aspect? Are there better ways to achieve it?

Thanks,
Yaron

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