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The delay number isn't the maximum value of the set, it is the mean average of the set. Dpinger reports average and standard deviation values against the entire set the same way ping does in its summary. Standard deviation is the square root of the variance, which is based upon squares of the offset from the mean. Use of squares means that the result can be higher than the mean.You can read the lengthy discussion of standard deviation on Wikipedia, or you can use one of the on-line calculators to experiment.Here is one that spells stuff out: http://www.mathsisfun.com/data/standard-deviation-calculator.htmlPut "2,2,2,2,2,20" for the numbers and start experimenting from there.Sorry about the cuteness of the page Quote from: NOYB on March 05, 2016, 03:31:32 pmHow can the standard deviation be greater than the maximum value of the data set?

How can the standard deviation be greater than the maximum value of the data set?

Yes I know std dev can be greater than the mean. Because of the graph/table labels it seems to indicate that it is greater than the max. So the graph/data table "delay" label is not very accurate.Delay is really average delay. Thus in the data table the min, avg, max, columns actually contain min avg delay, avg avg delay, max avg delay. Labeling the std dev row as "stddev of delay" seems to indicate that it is the std dev of the row labeled "delay". Which would be more accurately labeled "avg of delay".

packet loss should be red in color

So "delay" should be "avg delay" and "stddev of delay" should just be "stddev"?

Thanks, Monitoring works now.There should be some rounding of the values, see the attached Picture.Edit:This happens just when the 'Timer period' is greater than 1day.

Could we have more granularity than 5 minutes please? Especially on the 1 hour graph.The RRD has 60 data points an hour but the graph seem to display a granularity of only 12 data points per hour. Makes for nice smooth lines that look pretty for consumer class. Ideally a granularity selector based on the RRD data granularity of the selected graph time period would be nice. Thanks.

I think this would be sufficiently clear.Quote from: jdillard on March 07, 2016, 12:36:20 pmSo "delay" should be "avg delay" and "stddev of delay" should just be "stddev"?