UEM and Apdex question.
Hi,
I'm very familiar with Apdex (and I gues with UEM), but after looking at some visits I just wanted to confirm, given the following scenario:
There is a visit which shows up as Acceptable/Satisfied
If you drill down into actions, there are like 10 to 12 actions, one of them is Tolerable (for that particular app, the T value or threshold for Apdex is set on 4 seconds). The response time for that actions is around 5.5 seconds.
Now the rest of the actions are below 2 seconds of response time.
UEM shows the visit as Acceptable/Satisfied...question is, how many actions over 4 seconds would trigger the Satisfied status to Tolerable? How many samples would affect the overall status? It depends on the Apdex implementation and how you aggregate values/measures, etc...
Thanks in advance,
Carlos.
Hi Carlos,
The below is from documentation (User Experience Management#Apdex)
At the user action level, with threshold set to 4s, each user action can be classified as follows:
0 – 4 sec – Satisfied; 4 – 16 sec – Tolerating; >16 sec – Frustrated
At the Visit Level (one visit consists of 'n' number of user actions) user experience is computed as follows:
Users have satisfying experience if
- No action failed
- More than 50% of all page actions are satisfied
Users have a tolerating experience if
- Last action was not frustrating or failed
- Less than 50% of all actions were satisfying
- More than 50% of all actions were at least tolerating
Users have a frustrating experience if
- Last action failed ("The Web site does not work - I'm leaving!")
- Last action was frustrated ("The Web site is too slow - I'm leaving!")
- More than 50% of all actions were frustrating
To answer your question, how many actions over 4 seconds would trigger the Satisfied status to Tolerable?
With 12 actions in a visit, if more than 6 actions were >4s and last action was not frustrating or failed then the visit will be tolerating.
Thanks,
Srikar
Most welcome. One more thing I wanted to point out is that bandwidth can change the satisfied-tolerating and tolerating-frustrated threshold, this is also mentioned in the doc under 'Additional Bandwidth Factor in the Apdex Calculation'.
Srikar, this is exactly the level of information I was looking for, thanks for taking the time to share it with us.
Bests,
Carlos.
