Hi, You can find an explanation on those functions on this page describing RRD abberrant behavior detection algorithm: http://cricket.sourceforge.net/aberrant/rrd_hw.htm
(...) Summary of Aberrant Behavior Detection Algorithm Aberrant behavior detection is decomposed into three pieces, each building on its predecessor: (1) An algorithm for predicting the values of a time series one time step into the future. - Lower (2) A measure of deviation between the predicted values and the observed values. - Upper (3) A mechanism to decide if and when an observed value or sequence of observed values is 'too deviant' from the predicted value(s). - Anomalia (...) Cheers, Marino -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of JM Sent: 28 February 2010 13:59 To: [email protected] Subject: [Ntop] upper and lower values? Hey there, can someone actually explain what those "upper" and "lower" values finally are. I tried to search the net, to no avail. Just look at those strange "oscillations" of the "upper" value after a backup run: http://jeronimo.servehttp.com/tmp/rrdPlugin.png JM _______________________________________________ Ntop mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop _______________________________________________ Ntop mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop
