引用第1楼goodboy1于2007-03-12 16:46发表的“”:
请教一个抽检判定的问题。
我是初学AQL抽样检验水准和应用的菜鸟。
我想知道按抽样方案中几收几退的判定。比如是正常检验 level II,查表得一批产品是2收3退,这里所说的“2收”,其不良项目统计依据是什么?
或者说,是根据单个产品不良项目的简单累加,还是所在判定单体产品不良后,再累加?
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AQL is defined as the max % non-conforming (or the max no. of nonconformities per 100 units). For purposes of sampling inspection, can be considered satisfactory as a "process average". The phrase 'can be considered satisfactory' is interpreted as a "Producer's risk", α, equal to 0.05; actually, α varies from 0.01 to 0.10 in the standard. (Note: Plans may be designed for isolated lots by consulting the OC curve to determine the plan with the desired protection)
Sample size = n
Accept no. = c
Reject no. = c +1
Therefore,
If c=2, r=2+1=3
The following steps are suggested:
1. Determine the lot size.
2. Determine the inspection level.
3. Enter table and find sample-size code letter.
4. Determine the AQL (e.g. 0.65%).
5. Determine the type of sampling plan (Single, Double or Multiple).
6. Enter the appropriate table to find the Sampling Plan.
7. Start with normal inspection and change to Tightened or Reduced based on switching rule.