Information:

Environment

  • Gomez Synthetic Monitoring - Backbone
  • Synthetic Monitoring Backbone

 

Symptoms

 

Solution

Q. Does Gomez calculate average response times with a geometric mean or a arithmetic mean?

A. Arithmetic mean


Q. Does Gomez calculate an average of averages? For instance, do they calculate the response times for an hour, then average those hourly means to get the daily mean?

A. No. We add all the response times from successful tests for a given time period, then divide the sum by the number of successful tests.


Q. Are failed tests included in the response time average?

A. Failed tests have a response time of 0.0 seconds.

  • A test with a zero response time is not included in the average calculation, which is an arithmetic mean of all tests given over the breakdown period specified:
    • If a data point happens at every hour, the point will be the average of all tests in that hour
    • If the chart is for the last day, the average will be (sum(every test with response time > 0)/(total number of tests with response time > 0)), and not an average of the data points.

As such, a the response time of a failed test is not included in the average response time calculation.

Root Cause

 

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