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Definition of terms

Definition of terms

Definition of terms

(OP)
I've read in eng-tips forums, at least, one discussion about the meanings and differences between accuracy and precision.

What can participants also say about repeatability, reproducibility, replicability, and their relation with precision or accuracy ?

RE: Definition of terms

Terms are defined in ISO 5725/1...6 (1994), approx. 200 pages.Many people daily use termins repeatability, reproducibility, replicability, precision or accuracy without actually knowing what they speak about.
m777182

RE: Definition of terms

There was one excellent example we learned during college days. When you are shooting, accuracy indicates how much you are nearer to the bulls eye and precision indicates how many times you are nearer to your accurate hit.

RE: Definition of terms

Appendix D of NIST TN1297 Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results contains the NIST definitions of the various terms:
http://physics.nist.gov/Pubs/pdf.html

It's a very pedantic discussion, but at least it's free for downloading

TTFN

RE: Definition of terms

(OP)
When speaking of laboratory reports could we say, for example, as follows ?

Variance      
factor       replicability   repeatability  reproducibility

sample           equal           equal           equal
tester             equal         ↑at least       different
instrument      equal         {  one          different  
date               equal         ↓different     may differ
laboratory       equal           equal         different

RE: Definition of terms

You may also want to look at ISA 37.1, Electrical Transducer
Nomenclature and Terminology for these terms as applied to measurement instrumentation.

John

RE: Definition of terms

Also check ISA 51.1 Process Instrumentation Technology.

John

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