主差精度(main difference accuracy) vs. 精度(precision)

Accuracy and Precision are important concepts when talking about measurements. Although these two concepts are often interrelated, there is a marked difference between the two and the presence of one does not ensure the other, i.e., accuracy and precision are independent of each other. The main difference between accuracy and precision is that accuracy specifies how close a measurement is to the correct or accepted value whereas precision specifies the closeness of two or more measurements to each other.

什么是精确(accuracy)？

Accuracy is “the degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard.” In other words, accuracy specifies how close a measurement is to the accepted or correct value. Accuracy is getting a value that is close to the real value. For example, if you obtain a weight measurement of 3.2 kg value while the real value is 3.2, your measurement is accurate. Similarly, if you hit a bull’s eye in a shooting competition, your aim is accurate. Let’s look at another example to clarify the meaning of accuracy. Imagine a game of basketball; if the player shoots the ball into the or close to the basket, he is shooting with accuracy. But accuracy is not the only thing that will help him to win the game; he’ll also need precision. Now, let’s look what precision is.

什么是精度(precision)？

精度是“对测量、计算或规格的改进，特别是用给定的位数表示的。”换句话说，精度表示两个或多个测量值之间的接近程度。如果每次测量都得到相似的测量值，那么测量值是精确的。

让我们简单地看一下上面讨论的示例，看看如何对它们应用精度。如果你测量物体五次，每次测量3.2公斤，那么你的测量是精确的。同样，如果你在射击比赛中，每次都击中同一个地点，你的目标是精确的。

然而，同样重要的是要记住准确度和精密度是两个独立的概念。准确并不意味着精确。例如，您可能有精确性，但没有精确性。你可以击中靶心一次，但在那之后，你的目标可能会偏离。同样，你可能会击中同一个点，但它可能是远离牛眼。在这里，你有精确性，但没有精确性。

Low accuracy, good precision

精确(accuracy)和精度(precision)的区别

功能

精度：表示测量值与正确值或可接受值的接近程度。

精度：表示两个或多个测量值之间的接近程度。

测量

准确度：您的测量值将接近标准测量值。

精度：每次测量时，您的测量结果都是相似的。

相互依存

精度：精度不依赖于精度。

精度：精度不依赖于精度。

Image Courtesy:

“High precision Low accuracy” By DarkEvil – DarkEvil, based on Image:Accuracy and precision-highprecisionlowaccuracy.gif which is free.(Public Domain) via Comm*** Wikimedia 

图片2（公共领域）通过Pixbay