The Average Response Time value for a Device represents the sum of average response times of all Tasks within this Device for a given period.
Average values are calculated based on response time values. The average response time values are displayed in the “Duration (msec)” column of an online report:
The calculation engine sums up all the Task response times for a given period. The calculation engine then divides that result by the number of responses which gives “Average Response Time for a Task”. Because a Device is a container for multiple Tasks the calculation engine then sums up all the “Average Response Time for a Task” values and divides that number by the number of Tasks, which give an “Average response time for a Device” for a given period.