Difference Between Trueness & Bias Measurement

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SUMMARY

The discussion clarifies the distinction between trueness and bias in measurement, emphasizing that while both terms are often used interchangeably, they have specific meanings. Trueness refers to the closeness of a measured value to the true value, while bias indicates a systematic error that causes a measurement to deviate from the true value. The conversation highlights the historical context of these terms, noting that bias has been redefined in some fields to emphasize its positive aspects through the term trueness. Key references include ISO standards and academic resources that provide deeper insights into these concepts.

PREREQUISITES
  • Understanding of measurement concepts such as accuracy and precision
  • Familiarity with statistical terminology, particularly bias and error
  • Knowledge of ISO standards related to measurement
  • Basic research skills to navigate academic and online resources
NEXT STEPS
  • Research ISO 5725 standards for detailed definitions of trueness and bias
  • Explore statistical analysis techniques that address measurement bias
  • Study the implications of bias in various fields, such as medicine and legal practices
  • Review academic literature on accuracy and precision in measurement science
USEFUL FOR

This discussion is beneficial for statisticians, researchers, quality control professionals, and anyone involved in measurement science who seeks to understand the nuances of trueness and bias.

Roger Dodger
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Can someone explain the difference between trueness and bias, as used in measurement?
 
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As in accuracy and precision?

https://en.m.wikipedia.org/wiki/Accuracy_and_precision

Say you have a target and all your shots are near and around the center but spread out then you have accuracy but not precision. Another archer steps up and places his shots in a tight spread that is off center then he/she has precision but not accuracy.

Robin Hood steps up and shoots all his arrows dead center in a tight spread and so he has accuracy and precision.
 
I understand the distinction between accuracy and precision. However, the terms trueness and bias seem almost interchangeable and I am hoping someone can clarify the difference.
 
I found this also

https://www.astm.org/SNEWS/MARCH_2000/P&B_mar00.html
 
I appreciate the references, but the distinction between trueness and bias is what I seek.
 
Yes, I tried that.
 
It appears I missed this:

"The term bias has been in use for statistical matters for a very long time, but because it caused certain philosophical objections among members of some professions (such as medical and legal practitioners), the positive aspect has been emphasized by the invention of the term trueness."

That explains it.
 
  • #10
That's great where did you find that quote?
 
  • #11
It's at the bottom of the ISO link you provided.
 
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  • #12
Roger Dodger said:
I appreciate the references, but the distinction between trueness and bias is what I seek.
How do you define each?
 
  • #13
According to what I see, bias is now trueness. Their meanings are not distinct.
 

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