What is the round robin method, its advantages and disadvantages and the lottery method?

The research of circular method originated in the 1920s, and was praised as "the father of statistical quality control" by the famous statistician Walter armand Islom Tukhtakhodjaev.

) At that time, the concept of "plan-execution-inspection" was introduced. After Deming, the cycle of shewhart further developed into:

Plan-execute-check-handle. Deming cycle is a model of continuous quality improvement.

The lottery method is to number each unit of the survey population first, and then randomly select the numbers.

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Until enough samples are obtained. It is suitable for transactions with relatively large overall capacity. Because it is simple and easy to realize, it is widely used.