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Calculate average values for a trend

Solved1.71K views22nd September 2020trending
3
Arunkrishna Shreeder [SLC] [DevOps Advocate]4.03K 21st September 2020 0 Comments

Hi Dojo,

How are the average values for a trend calculated from the real-time values?

For example, I export the trend as CSV on a 5-minute interval (image below)

Similarly I obtain the real-time data.

If I compare the 5-minute interval CSV file's values with that of the real-time values, I am not able to establish a relationship on how the averages are calculated.

Please can you teach me how the 5-minute interval averages are calculated (preferably with an example), thanks in advance.

Marieke Goethals [SLC] [DevOps Catalyst] Edited question 22nd September 2020

2 Answers

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Toon Casteele [SLC] [DevOps Enabler]7.02K Posted 21st September 2020 0 Comments

I'm only aware of how we do this in DataMiner Cube for client side averaging, but as far as I know it's supposed to function the same way for server side averaging.

For every time slot of 5 minutes (or whatever you have configured) a weighted average is taken of the real-time values. What I mean by weighted might become more clear if I give a fictitious example. Consider the following changes:

  • 01:00:00 -> value = 10
  • 01:04:00 -> value = 20
  • 01:07:00 -> value = 40

Because the value 10 lasted for 4 minutes within the first 5 min time slot and value 20 only lasted 1 minute in that interval (the end of the interval is 01:05:00), the average value of this point in the DB should be:

(10 * 4 + 20 * 1) / 5 = 12

The min value will be 10 for this slot and the max value 20.

Similarly you can make the same exercise for the next 5 minutes, where that should bring you to an average value of 32.

Arunkrishna Shreeder [SLC] [DevOps Advocate] Selected answer as best 22nd September 2020
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