Hi, just a comment about how I get the percentiles from my RRDtool data:
Cacti (a RRDtool GUI) has a variable "Nth Percentile", see http://cacti.net/downloads/docs/html/variables.html. Cacti does not use the built-in RRDtool function. UNKOWN values are ignored and the result is as you would expect. Nth can be any number between 1 and 99. Cheers Ralf On Tuesday 05 September 2006 20:01, Dan Cech wrote: > Hello All, > > I have a question regarding calculating percentiles. > > Specifically, I have a graph showing data over which I need to overlay a > 95th percentile line. > > However, when I'm displaying the graph for the current month, the > PERCENT function is using all the unknown future values in the > calculation, causing it to be incorrect. > > As a very simplified example, say I'm 10 days into a month (with 20 days > remaining) and the values so far look like this: > > 1,2,3,4,5,6,7,8,9,10 > > The 90th percentile should be 9, but in fact it will be 7 because > PERCENT will use the 20 NaN values in the calculation. > > I have looked through the documentation and can't find any mechanism > which would allow me to restrict the PERCENT function to a specific date > range (to exclude values in the future), or exclude NaN values. > > Any suggestions would be appreciated. > > Thanks, > > Dan > > -- > Unsubscribe mailto:[EMAIL PROTECTED] > Help mailto:[EMAIL PROTECTED] > Archive http://lists.ee.ethz.ch/rrd-users > WebAdmin http://lists.ee.ethz.ch/lsg2.cgi -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/rrd-users WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
