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<div style="">This sounds like the perfect application for the Holt-Winters analysis functions in RRDTool.<br>
<br>
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>
<br>
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>
<br>
Steve<br>
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<div style="font-family: Tahoma; font-size: 13px;"><strong>Steve Shipway</strong></div>
<div style="font-family: Tahoma; font-size: 13px;">University of Auckland ITS</div>
<div style="font-family: Tahoma; font-size: 13px;"><em>UNIX Systems Design Lead</em></div>
<div style="font-family: Tahoma; font-size: 13px;"><a href="mailto:s.shipway@auckland.ac.nz">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;" id="divRpF877546"><font size="2" color="#000000" face="Tahoma"><b>From:</b> rrd-users-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch] on behalf of krad [kraduk@gmail.com]<br>
<b>Sent:</b> Thursday, 18 November 2010 12:46 p.m.<br>
<b>To:</b> rrd-users@lists.oetiker.ch<br>
<b>Subject:</b> [rrd-users] Creating a graph averaged over a week<br>
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<br>
Hi,<br>
<br>
Ok background first, as this isnt as obvious as it sounds.<br>
<br>
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.
<br>
<br>
ie<br>
<br>
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>
<br>
I would also like a generic weekday, weekend, and week graphs<br>
<br>
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>
<br>
<br>
<br>
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