What do accuracy and precision mean

What is Accuracy? What is Precision? What is the difference between Accuracy and Precision? Example of the difference between Accuracy and Precision… The example of a darts board is often used when talking about the difference between accuracy and precision. How can Precisa help you with your Precision Measurements? At Precisa, ensuring the precision of your measurements is our top priority.

Repeatability : The variation observed when the same operator measures the same part repeatedly with the same device. Reproducibility : The variation observed when different operators measure the same part using the same device. A dart board can help us visualize the difference between the two concepts:. Accurate and Precise Precise Accurate, but not Precise Neither Accurate nor Precise.

Maybe this example can help to further show the differences. You test the weight of the bags using a scale that measures the bags precisely in other words, there is little variation in the measurements , but not accurately — measuring Or maybe the scale is accurate, measuring the three samples at You can be very precise but inaccurate, as described above. You can also be accurate but imprecise. For example, if on average, your measurements for a given substance are close to the known value, but the measurements are far from each other, then you have accuracy without precision.

A good analogy for understanding accuracy and precision is to imagine a basketball player shooting baskets.