Precision Vs Accuracy

Precision is a measure of exactness. For example, the magnitude for each
increment on the measurement’s number line is the interval that determines
the measurement’s precision—the greater the number of increments, the
greater the precision.

Accuracy is an assessment of correctness. For example, if the measured
value of an item is very close to the true value of the characteristic
being measured, the measurement is more accurate.

An illustration of this concept is the comparison of archery targets.
Arrows clustered tightly in one area of the target, even if they are not clustered in the bull’s-
eye, are considered to have high precision.

Targets where the arrows are more spread out but equidistant from the
bull’s-eye are considered to have the same
degree of accuracy.

Targets where the arrows are both tightly grouped and within the bull’s-eye
are considered to be both accurate and precise. Precise measurements are
not necessarily accurate measurements, and accurate measurements are not
necessarily precise measurements.

Regards
Kshitij yelkar
www.yelkar.com