Using weighted averages to calculate ASA and abandonment rate

Your ACD should report ASA and abandonment rate for defined time periods, considering the volume handled. However, if management wants you to combine time periods, using a weighted average provides a more realistic picture of a particular measurement versus a straight average

Upper management would like me to use weighted averages for determining average speed of answer and abandonment rate. I believe they were referring to call volume, which is (10% - 20%) higher on certain days of the week. However, I do not see a direct correlation between call volume and average speed of answer and abandonment rate (due to staffing levels, types of calls, distribution of calls, etc.). So, I'm not sure if weighted averages would apply in this case and I'm not even sure how I would apply weighted averages. Your thoughts?

Your ACD should report ASA and abandonment rate for defined time periods, considering the volume handled. However, if management wants you to combine time periods, using a weighted average provides a more realistic picture of a particular measurement versus a straight average which skews data and weights all periods equally. The example below shows calculations for straight averages and weighted averages.

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Example: Calls handled SVL Monday 550 80% Tuesday 300 65% Wednesday 150 90%

Total 1000 Straight average (80+65+90)/3 = 78.3% Weighted average (550x80)+(300x65)+(150x90)/ 1000 = 77%

The "right" way to do it depends on your definitions and targets, and how your system calculates. For example, if your target is to meet a certain abandon rate each day, then your system should provide the required data. If you need to meet a target each week, you'll need to look at whether your system provides that performance indicator on a weekly basis, and how it calculates it.

This was last published in July 2009

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