# Trueness and Bias

• B

## Main Question or Discussion Point

Can someone explain the difference between trueness and bias, as used in measurement?

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jedishrfu
Mentor
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 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.

jedishrfu
Mentor
That's great where did you find that quote?

It's at the bottom of the ISO link you provided.

jedishrfu
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