Accuracy or Precision

Accuracy

indicates the closeness of the measurement to the true or accepted value and is expressed by the error.

Accuracy

measures agreement between a result and the accepted value.

Accuracy

often more difficult to determine because the true value is usually unknown. An accepted value must be used instead.

Accuracy

is expressed in terms of either absolute or relative error.

Precision

describes the agreement among several results obtained in the same way.

Precision

Describes the reproducibility of measurements.

Precision

is readily determined by simply repeating the measurement on replicate samples.

Precision

a set of replicate data may be expressed as standard deviation, variance, and coefficient of variation.