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There are three performance zones or levels of satisfaction for a task as defined by Apdex.
Satisfied user | Tolerating user | Frustrated user |
User can focus on task, progress is not hindered | User notices slowdown, productivity is impaired | User unhappy with slow response, may stop working on a task |
Load_time < T-Value | T-value <load_time < 4*(T-value) | load_time > 4*(T-value) |
So if our T-value is 2 seconds, 8 seconds will be our frustration threshold. We might have some users frustrated and still have an acceptable performance.
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The Apdex formula is the number of satisfied samples plus half of the tolerating samples plus none of the frustrated samples, divided by all the samples:
Apdext Apdex = (Satisfied Count + (Tolerating Count / 2)) / Total Samples
There are counts of response time measurement samples within the above defined performance zones of:
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General the rating of the performance application as defined by Apdex is a follows:
Apdex value range | Rating |
0,94 tot 1,00 | Excellent |
0,85 to 0,93 | Good |
0,70 to 0,84 | Fair |
0,50 to 0,69 | Poor |
0,00 to 0,49 | Unacceptable |
The goal for Blueriq applications is to have an Apdex value for all tests > 0.85.
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