What is accuracy and precision

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By Team Operations Refine processes. Finance Increase Margins. About Forecast Learn more about Forecast. Leadership Learn about the team leading Forecast. Open Positions See all open positions at Forecast. Precision refers to the closeness of two or more measurements to each other.

Using the example above, if you weigh a given substance five times, and get 3. Precision is independent of accuracy. You carry out the experiment and obtain a value. Just to be on the safe side, you repeat the procedure on another identical sample from the same bottle of vinegar. If you have actually done this in the laboratory, you will know it is highly unlikely that the second trial will yield the same result as the first. In fact, if you run a number of replicate that is, identical in every way trials, you will probably obtain scattered results.

With multiple measurements replicates , we can judge the precision of the results, and then apply simple statistics to estimate how close the mean value would be to the true value if there was no systematic error in the system. Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:. It's a simple and useful calculation. Actively scan device characteristics for identification. Use precise geolocation data.

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Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter.