cool thank you for the pointer, ill let the list know my progress in a week or so<br><br><div class="gmail_quote">On 18 November 2010 08:33, Steve Shipway <span dir="ltr"><<a href="mailto:s.shipway@auckland.ac.nz">s.shipway@auckland.ac.nz</a>></span> wrote:<br>
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<div>This sounds like the perfect application for the Holt-Winters analysis functions in RRDTool.<br>
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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.<br>
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The documentation on H-W is fairly brief, and its a difficult one to understand, but the defaults and example parameters work fairly well.<br>
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Steve<br>
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<div style="font-family: Tahoma; font-size: 13px;"><b>Steve Shipway</b></div>
<div style="font-family: Tahoma; font-size: 13px;">University of Auckland ITS</div>
<div style="font-family: Tahoma; font-size: 13px;"><i>UNIX Systems Design Lead</i></div>
<div style="font-family: Tahoma; font-size: 13px;"><a href="mailto:s.shipway@auckland.ac.nz" target="_blank">s.shipway@auckland.ac.nz</a></div>
<div style="font-family: Tahoma; font-size: 13px;">Ph: +64 9 373 7599 ext 86487</div>
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<div style="direction: ltr;"><font size="2" color="#000000" face="Tahoma"><b>From:</b> rrd-users-bounces+s.shipway=<a href="http://auckland.ac.nz" target="_blank">auckland.ac.nz</a>@<a href="http://lists.oetiker.ch" target="_blank">lists.oetiker.ch</a> [rrd-users-bounces+s.shipway=<a href="http://auckland.ac.nz" target="_blank">auckland.ac.nz</a>@<a href="http://lists.oetiker.ch" target="_blank">lists.oetiker.ch</a>] on behalf of krad [<a href="mailto:kraduk@gmail.com" target="_blank">kraduk@gmail.com</a>]<br>
<b>Sent:</b> Thursday, 18 November 2010 12:46 p.m.<br>
<b>To:</b> <a href="mailto:rrd-users@lists.oetiker.ch" target="_blank">rrd-users@lists.oetiker.ch</a><br>
<b>Subject:</b> [rrd-users] Creating a graph averaged over a week<br>
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Hi,<br>
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Ok background first, as this isnt as obvious as it sounds.<br>
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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.
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ie<br>
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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.<br>
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I would also like a generic weekday, weekend, and week graphs<br>
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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<br>
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