Skip Lot Sampling Plans (SkSP) - Oil for Trans Fatty Acid Content

T

truongson0528

#1
Dear all,
Someone can help me, I am a newbie about Quality assurance and Statistical.

We have checked 300lots (100% inspection) of oil for Trans fatty acid content (one lot of oil is a tank oil, anh we have taken one sample per lot). We have no certification of produce about Trans fatty acid content but all of 300 lots were passed (zero defect).

Now we want to apply skip lot sampling plan as ISO 2859-3:2005. Howerver, as this standard, we reduce only 5 times (one sample per 5 lot, f=1/5). We want reduce more frequency of testing.
How we could reduce more frequency of testing (for example: f=1/10; f=1/20...)?

Do you have SkSP-1 table about (f, i, AOQ, AOQL, AQL...)?

Thank you for your quick reply.
 
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Statistical Steven

Statistician
Staff member
Super Moderator
#3
Dear all,
Someone can help me, I am a newbie about Quality assurance and Statistical.

We have checked 300lots (100% inspection) of oil for Trans fatty acid content (one lot of oil is a tank oil, anh we have taken one sample per lot). We have no certification of produce about Trans fatty acid content but all of 300 lots were passed (zero defect).

Now we want to apply skip lot sampling plan as ISO 2859-3:2005. Howerver, as this standard, we reduce only 5 times (one sample per 5 lot, f=1/5). We want reduce more frequency of testing.
How we could reduce more frequency of testing (for example: f=1/10; f=1/20...)?

Do you have SkSP-1 table about (f, i, AOQ, AOQL, AQL...)?

Thank you for your quick reply.
Here is a link for a general overview
http://www.itl.nist.gov/div898/handbook/pmc/section2/pmc27.htm

Without having the standard in hand, it is hard for me to tell you how to calculate AOQ, etc.
 
T

truongson0528

#4
Hi Steven,
I attached ISO 2859-3:2005 with this Post. As this standard, if supplier is so good, the minimum of f parameter of skip lot sampling is smallest only f=1/5. We really want to reduce more f for reason of cost of testing. But we don't know in our case, we could reduce more f to 1/10 or 1/20 and what is the base for this reduction.
Please help us in this case.

With your link, i read it carefully. However it seems to be very hard for me to understand and apply it in order to calculate f, i, AOQ... I am very grateful if you have some thing more simply about SkSP-1 for example SkSp-1 table.

Thank in advance.

NOTE: Copyrighted document removed. Sorry about that.
 
Last edited by a moderator:
O

Ocean Medical

#5
I have read the string of responses and wonder if there is a simple FORM that can be used to document the change from every lot to one out of every 5 lots to assure quality. E.g. after having no failures with 20 lots on tensile tests, burst tests (of 5 finished components samples from a lot of 50 catheters) it is time to skip lots (e.g. reduce to testing 5 samples every 5 lots).. is it a simple note to file or is there is form to fill out?
 

Statistical Steven

Statistician
Staff member
Super Moderator
#6
I have read the string of responses and wonder if there is a simple FORM that can be used to document the change from every lot to one out of every 5 lots to assure quality. E.g. after having no failures with 20 lots on tensile tests, burst tests (of 5 finished components samples from a lot of 50 catheters) it is time to skip lots (e.g. reduce to testing 5 samples every 5 lots).. is it a simple note to file or is there is form to fill out?
I typically document skip lots or reduced inspection in the procedure or test plan. There is no real form or note, since the decision to skip lots of reduce sampling would be covered in the test plan for the catheter.
 
S

statixel

#7
Hi, please
I want a excel file that calculates the efficiency curve and the control plane automatically: one entering the four parameters:
- (Unacceptable quality & maximum exposure lot to accept this lot) Client
- (Irr?fusable lot quality & maximum risk of being reffuser this lot) Supplier
- The size of the lot to be sampled.
The plan is then calculated taking into account the rate of inspected parts (binomial or hypergeometric). The efficiency curve is presented at the same time.

It's an emergency for me and a would say thank's to everyone hwo can help me
 
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