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Question by Carlos S. · Dec 16, 2014 at 03:40 AM ·

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. 

 

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Answer by Srikar M. · Dec 16, 2014 at 04:11 AM

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

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Ravi K.

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Answer by Srikar M. · Dec 16, 2014 at 09:50 AM

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'.

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Answer by Carlos S. · Dec 16, 2014 at 06:28 AM

Srikar, this is exactly the level of information I was looking for, thanks for taking the time to share it with us.

Bests,

Carlos.

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