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A comment on New research: cashiers who have their own lines move customers more quickly. Parent comment

Re:New research: cashiers who have their own lines move cust... by mabbo on Sunday June 12, 2016 @07:56AM (#11887687)
Only matters if you care about average latency.

Just like the website load times, you should be focused on the 99th percentile and the median. Single line reduces those metrics.

Really this boils down to whether the business is interested in saving a bit of money (fewer cashiers per purchase) or improving customer experience.

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Re:New research: cashiers who have their own lines move cust... by ThrustVectoring on Sunday June 12, 2016 @10:59AM (#11888366)
Occasionally causing large delays while maintaining the same mean response time will increase the 99th percentile and lower the median.

The metric you want is to figure out what wait time constitutes good/acceptable/bad service, and what percentage of people get that service.

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