Accuracy and precision

Aspect

Accuracy

Precision

Definition

The closeness of measurements

to the true value.

The closeness of repeated

measurements to each other.

Focus

How close the measured values

are to the actual value.

How consistently the same value

is obtained upon repetition.



Accuracy example: The measured blood pressure values (118/78, 120/80, 122/82, 124/84) are close to the true value (120/80), indicating high accuracy.


Precision example: The measured blood pressure values (136/90, 134/92, 132/90, 134/94) are close to each other, indicating high precision, even though they are not close to the true value (120/80).


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