SLA and Abandon Formulas in Erlang

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SLA and Abandon Formulas in Erlang
Hi Guys,

I have a question regarding SLA and ABN formulas in Erlang.
I try to get the expected service level and abandon level for a day, with 30 minute breakdown. Therefore, I calculate both values by using Erlang for every interval. I get the total amount of calls in SL and Abandoned.
But my question is, does SLA formula have into account abandon?
Example. In a 30 minute interval, I expect to have 50 offered calls. I have 9 agents scheduled. The SLA is 80/20 and AHT 240 secs.
What I get is 74,2% SL (37 calls in SL) and 7,3% ABN (4 abandoned calls)
So, the composition for that interval would be:
50 offered calls
4 abandoned calls
37 calls handled before 20 seconds (in SL)
9 calls handled after 20 seconds
Is it correct? Or do I have to apply SLA only for 46 call (50 offered – 4 abandoned)? SLA formula is considering that there will be 4 abandoned calls?
I appreciate you help.
Thanks.

Helper

Call Centre Helper

SLA and Abandon come from two formulas
SLA and Abandon come from two formulas.

https://www.callcentrehelper.com/a-beginners-guide-to-the-erlang-a-formula-140998.htm

The Erlang Calculator works out the SLA on the calls offered, not the calls abandoned.

The problem is that if you work on , for example 46 calls (50 offered – 4 abandoned) then this would lead to understaffing, which is already a major headache for the industry.

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