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Frequency and magnitude of sampling

testing laboratory samples frequency how often volume complaints

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#1 Samurai Sam

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Posted 19 February 2018 - 06:57 PM

Hello,

 

I was wondering if any one has ever done a risk assessment for the number of laboratory samples for any product or group of products for a specific time period , required based on volume produced, number of Complaints , complexity of the product making and its ingredients?

I need to justify the samples I am sending to laboratory are based on risk analysis considering all the above factors.

any formula that can calculate the risk of the products?

 

any help is appreciated. 



#2 redfox

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Posted 20 February 2018 - 01:38 AM

Hello Samurai Sam,

 

Please see files attached. It may help.

 

regards,

redfox

Attached File  Sample Size_ifsqn1.pdf   314.78KB   117 downloads

Attached File  Sample Size_ifsqn1.pdf   314.78KB   117 downloads

Attached File  Sample Size_ifsqn1.pdf   314.78KB   117 downloads



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#3 Charles.C

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Posted 20 February 2018 - 09:13 AM

Hello,

 

I was wondering if any one has ever done a risk assessment for the number of laboratory samples for any product or group of products for a specific time period , required based on volume produced, number of Complaints , complexity of the product making and its ingredients?

I need to justify the samples I am sending to laboratory are based on risk analysis considering all the above factors.

any formula that can calculate the risk of the products?

 

any help is appreciated. 

 

Hi SS,

 

Indeed many, many people have written innumerable books on aspects of yr question. Especially Statisticians.

 

A simple answer is that any formula will typically depend on the specific objective of yr sampling / analysis.

 

You probably need to present a specific case to get relevant responses.

 

Some basic thoughts are discussed in this thread/sublinks (and sub-sub links) -

 

http://www.ifsqn.com...-sampling-plan/


Kind Regards,

 

Charles.C


#4 Charles.C

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Posted 20 February 2018 - 09:59 AM

addendum

 

Another activity which can assist in demonstrating confidence in yr analytical results (ie minimising the risk of error) is to routinely, eg annually, engage in a ring test. This topic is also discussed on this forum.


Kind Regards,

 

Charles.C


#5 redfox

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Posted 21 February 2018 - 12:10 AM

Hello Samurai Sam,

 

I pasted the same article....please see another articles.

 

Regards,

redfox

 

Attached File  Sample Size Chart_ ifsqn2.pdf   66.55KB   30 downloads

Attached File  Sample Size for Zero Nonconforming Items.pdf   170.24KB   32 downloads

Attached File  The Special Inspection Levels in the AQL Tables_ifsqn3.docx   89.63KB   31 downloads

 

 

 



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