[rrd-users] Creating a graph averaged over a week

[Steve Shipway]

This sounds like the perfect application for the Holt-Winters analysis functions in RRDTool.

If you have RRD version 1.3 or (preferably) 1.4, then you can add Holt-Winters RRAs to the RRD file.  These can be set up with a 1-week period, and will then give you not only the predicted value that you want, but also a confidence band and even a method of highlighting deviations from the expected values.

The documentation on H-W is fairly brief, and its a difficult one to understand, but the defaults and example parameters work fairly well.

Steve

Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.shipway at auckland.ac.nz<mailto:s.shipway at auckland.ac.nz>
Ph: +64 9 373 7599 ext 86487

________________________________
From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of krad [kraduk at gmail.com]
Sent: Thursday, 18 November 2010 12:46 p.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] Creating a graph averaged over a week




Hi,

Ok background first, as this isnt as obvious as it sounds.

I'm logging a data feed of my household power consumption. I have got graphs working fine for the standard fair daily,weekly monthly etc. However they are bit spiky. Therefore what I would like to do is generate one for a generic monday, tuesday etc. By this a mean is keep a high resolution of data over say a 28 day cycle (maybe more). Then generate a day graph that plots the average value for x time in a day.

ie

add up all the data points for say 09:30:00 on a monday and / 4 and then plot that point and so on for all of the 4 monday data points.

I would also like a generic weekday, weekend, and week graphs

Is this something rrdtool can do? At the moment I cant see how I could as all the x axis values would be different as they are time based




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