Note that OpenOffice.org Calc has STDEV and STDEVP functions that calculate the two different versions of std. dev.; I imagine Excel has similar functions.
On 1 September 2011 16:06, Sherif Amer <sherif.moh.a...@gmail.com> wrote: > Thanks very much for the clarification, i will re create the full test > scenario and update you. > > On Thu, Sep 1, 2011 at 3:37 PM, sebb <seb...@gmail.com> wrote: > >> On 1 September 2011 15:17, Sherif Amer <sherif.moh.a...@gmail.com> wrote: >> > view result in *table* >> >> OK, I see - you mean the figure in red at the bottom of the screen. >> >> I have just written a test using the Java sampler so I can ensure that >> the correct times are created. >> >> I get the same average, but the deviation is calculated as 280, not 581 or >> 323. >> Same if I use the Summary Listener. >> >> The JMeter value agrees with the "population standard deviation", >> where the sum of square diffs is divided by the number of values (i.e. >> 4) before taking the square root. >> >> The value 323 results from dividing the sum of squares diffs by 3 (= >> 4-1) and then taking the square root. >> This is the "sample standard deviation". >> >> Both are valid interpretations of standard deviation. Perhaps JMeter >> should have used the latter, but it does not. >> >> I don't understand where the value 581 comes from. >> If you still have the raw sample data, perhaps you can create a >> Bugzilla issue and attach the JTL file with a screenshot of the Table >> Listener. >> >> > On Thu, Sep 1, 2011 at 3:13 PM, sebb <seb...@gmail.com> wrote: >> > >> >> On 1 September 2011 15:06, Sherif Amer <sherif.moh.a...@gmail.com> >> wrote: >> >> > Which sampler were you using? >> >> > *HTTP request* >> >> >> >> Sorry, I meant - which Listener were you using? >> >> >> >> > Which version of JMeter? >> >> > *2.4* >> >> > >> >> > On Thu, Sep 1, 2011 at 2:21 PM, sebb <seb...@gmail.com> wrote: >> >> > >> >> >> On 1 September 2011 13:56, Sherif Amer <sherif.moh.a...@gmail.com> >> >> wrote: >> >> >> > i made load test for 4 pages and the sample time was >> >> 426,1093,1127,921 >> >> >> and >> >> >> > when i showed the result in table >> >> >> > >> >> >> > The average was 892 which is ok >> >> >> >> >> >> Agreed. >> >> >> >> >> >> > And the deviation was 581 which is totally wrong, if you calculate >> it >> >> >> > yourself the result will simply will be 323. >> >> >> >> >> >> Which sampler were you using? >> >> >> >> >> >> Which version of JMeter? >> >> >> >> >> >> > On Thu, Sep 1, 2011 at 1:48 PM, sebb <seb...@gmail.com> wrote: >> >> >> > >> >> >> >> On 1 September 2011 13:43, Sherif Amer <sherif.moh.a...@gmail.com >> > >> >> >> wrote: >> >> >> >> > hello !! >> >> >> >> > >> >> >> >> > i have question :) does Jmeter calculating the the deviation >> >> >> incorrectly >> >> >> >> in >> >> >> >> > the listener like the table and graphic shapes ? >> >> >> >> >> >> >> >> No. >> >> >> >> >> >> >> >> What makes you think the calculations are wrong? >> >> >> >> >> >> >> >> Please provide some evidence. >> >> >> >> >> >> >> >> > Regards, >> >> >> >> > >> >> >> >> > Sherif Amer >> >> >> >> > >> >> >> >> >> >> >> >> >> --------------------------------------------------------------------- >> >> >> >> To unsubscribe, e-mail: >> jmeter-user-unsubscr...@jakarta.apache.org >> >> >> >> For additional commands, e-mail: >> jmeter-user-h...@jakarta.apache.org >> >> >> >> >> >> >> >> >> >> >> > >> >> >> >> >> >> --------------------------------------------------------------------- >> >> >> To unsubscribe, e-mail: jmeter-user-unsubscr...@jakarta.apache.org >> >> >> For additional commands, e-mail: jmeter-user-h...@jakarta.apache.org >> >> >> >> >> >> >> >> > >> >> >> >> --------------------------------------------------------------------- >> >> To unsubscribe, e-mail: jmeter-user-unsubscr...@jakarta.apache.org >> >> For additional commands, e-mail: jmeter-user-h...@jakarta.apache.org >> >> >> >> >> > >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: jmeter-user-unsubscr...@jakarta.apache.org >> For additional commands, e-mail: jmeter-user-h...@jakarta.apache.org >> >> > --------------------------------------------------------------------- To unsubscribe, e-mail: jmeter-user-unsubscr...@jakarta.apache.org For additional commands, e-mail: jmeter-user-h...@jakarta.apache.org
