[smokeping-users] Re: graph question
oetiker at ee.ethz.ch
Fri Apr 15 15:18:03 MEST 2005
Wednesday Arnold Nipper wrote:
> On 13.04.2005 05:35 Jason D. Hammerschmidt wrote
> >>> This is going to be a really dumb question, but can someone explain
> >>> to me
> >>> the relevance of the light/dark gray entries on the smokeping graphs?
> >>> Is
> >>> this the variance over the 20 requests?
> >> Actually it's not really the variance but all of the n values scattered
> >> around the median.
> > Excellent question actually, but I am confused about the answer. If
> > it's variance around the median, why do so many of my graphs show grey
> > lines skewed on only one side? Usually upwards? If it was around the
> > median, should it be grey on both sides of the main coloured bar? Or
> > does that represent something different?
> Imho that may only happen when the set of ping results consists of only
> two values. The lower one is the coloured line and you have exactly one
> grey shadow above. In any other case you should have grey shadows on
> *both* sides of the coloured line.
assume you have the following values
then the median is 5 ... and you will see grey only above ... this
is actually quite a normal behaviour ... since pakets seldom travel
faster, than normal ... only slower ...
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