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Inter-Laboratory Proficiency Testing Result Analysis - z Score or Normalized Error

E

evg78

#1
Hello Everyone,

Let me start of by saying that this site has been so helpful for our ISO 17025 accreditation process. Thank you for all the information.

We are a testing laboratory getting ready for our very first ISO 17025 audit. I just received the inter laboratory proficiency testing results.

I would like to know what is a preferred statistical analysis, z score or a normalized error (En) determination to present to the accrediting body?

I came across some information that suggested the En determination applies more to calibration labs, while z score is preferred for the testing labs.

Any help would be greatly appreciated.

Best Regards,
Edgar
 
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Ajit Basrur

Staff member
Admin
#2
Re: Inter-Laboratory Proficiency Testing Result Analysis - z Score or Normalized Erro

Edgar,

Congratulations and Welcome to the Cove :bigwave:

Its great to hear that the Cove was useful for you and your Laboratory.

The activity is slow during weekends and hence you will get response to your questions next week :)
 

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#3
Re: Inter-Laboratory Proficiency Testing Result Analysis - z Score or Normalized Erro

Hello Everyone,

Let me start of by saying that this site has been so helpful for our ISO 17025 accreditation process. Thank you for all the information.

We are a testing laboratory getting ready for our very first ISO 17025 audit. I just received the inter laboratory proficiency testing results.

I would like to know what is a preferred statistical analysis, z score or a normalized error (En) determination to present to the accrediting body?

I came across some information that suggested the En determination applies more to calibration labs, while z score is preferred for the testing labs.

Any help would be greatly appreciated.

Best Regards,
Edgar
Your source is correct, z-score is for testing, En is for calibration. The documents from APLAC may help clarify that for you. They are PT-001 (calibration) and PT-002 (testing), available at no charge from www.aplac.org

Hence, if you are a test lab, your AB will look at z-score.

Hope this helps.
 
E

evg78

#4
Re: Inter-Laboratory Proficiency Testing Result Analysis - z Score or Normalized Erro

Hershal,

Thank you for taking the time to provide an answer. The website was very helpful.

Best Regards,
Edgar
 
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