2024年4月4日发(作者：电脑小白买电脑必备知识)
准确度(Accuracy)与精密度(Precision)的区别
In the fields of engineering, industry and statistics, the accuracy of
a measurement system is the degree of closeness of measurements of
aquantity to its actual (true) value. The precision of a measurement system, also
called reproducibility or repeatability, is the degree to which repeated
measurements under unchanged conditions show the same results.
[1]
Although
the two words can be synonymous in colloquial use, they are deliberately
contrasted in the context of the scientific method.
Accuracy准确度 is the difference between the measured value and the true
value of a tested material.
Precision精确度 is the repeatability of successive measurements under the
same conditions.
测量的精密度、准确度和精确度
这是人们在测量中常常容易混淆的三个名词，虽然它们都是评价测量结果好坏的，但
涵义有较大的差别。
1．测量的精密度高，是指偶然误差较小，这时测量数据比较集中，但系统误差的大小
并不明确。
2．测量的准确度高，是指系统误差较小，这时测量数据的平均值偏离真值较少，但数
据分散的情况，即偶然误差的大小不明确。
3．测量精确度（也常简称精度）高，是指偶然误差与系统误差都比较小，这时测量数
据比较集中在真值附近。
Accuracy
Accuracy is how close a measured value is to the actual (true) value.
Precision
Precision is how close the measured values are to each other.
准确度（Accuracy）：指在一定实验条件下多次测定的平均值与真值相符合的程度，
以误差来表示。它用来表示系统误差的大小。
精密度（Precision）：是指多次重复测定同一量时各测定值之间彼此相符合的程度。
表征测定过程中随机误差的大小。
（精密度高是指重复性好repeatability，描述仪器本身的性能用precision；最对比
实验得到的结果用准确度accuracy，对比仪器的值可看作真值；一般实验结果给出的是标
准偏差standard deviation，用不确定度uncertainty表示）
精确度=准确度+精密度
可用下图表示：
Accuracy and precision in binary classification
"Accuracy" is also used as a statistical measure of how well a binary
classification test correctly identifies or excludes a condition.
That is, the accuracy is the proportion of true results (both true positives and
true negatives) in the population. It is a parameter of the test
On the other hand, precision is defined as the proportion of the true
positives against all the positive results (both true positives and false positives)
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