It's a standard deviation calculation. I'd be happy to receive any statistics help knowledgeable users want to give :-)
-Mike On 12 Sep 2003 at 14:37, Andreas Fransson wrote: > OK listen up, > > I've been struggeling with JMeter for a while and done some tests, but one > thing still confuses me. You get nice looking graphs containing Data, > Average and Deviation. I suppose that Data stands for a sample's Round Trip > Time (RTT) and Average for the average RTT value, BUT Deviation? What kind > of deviation is it. I have hard to believe that is it standard deviation due > to some factors. But the most obvious one, if you spam a server until is > starts dropping packets the Average and Deviation grows bigger, right? (In > most casese anyway) If the Deviation is Standard Deviation how on earth can > the same amount of samples appear below the average value as above. Example: > (the number are just made up for visual purpose) > > Data: Average: Diviation: > 200 106 106 > 98 106 106 > 100 106 106 > 99 106 106 > 99 106 106 > 300 106 106 > 98 106 106 > 98 106 106 > > This is a scenario that happens most of the time. The Data values are > concentrated round the average and some samples takes way longer time than > the average one. Please say that the diviation isn't a standard diviation. I > would like to use a chi-square distribution to approx. the samples. If you > know what distribution that is used, please let me know... > > //Andreas > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: jmeter-user- [EMAIL PROTECTED] > For additional commands, e-mail: jmeter-user- [EMAIL PROTECTED] > -- Michael Stover [EMAIL PROTECTED] Yahoo IM: mstover_ya ICQ: 152975688 AIM: mstover777 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
