B Difference Between Trueness & Bias Measurement

AI Thread Summary
Trueness and bias in measurement are often confused, but they have distinct meanings. Trueness refers to how close a measurement is to the true value, while bias indicates a systematic error that skews results away from the true value. The discussion highlights that bias has been historically used in statistical contexts, but the term trueness was introduced to emphasize a more positive aspect of accuracy. The distinction is significant in fields like statistics and measurement, where understanding the nuances can impact data interpretation. Overall, while trueness relates to accuracy, bias reflects systematic deviations from that accuracy.
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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Likes jedishrfu
  • #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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