分类器评估参数——准确度和精度的区别（足球荔枝）

refer to http://www.mathsisfun.com/accuracy-precision.html

准确率accuracy 和 精度precision 的不同：

（1）Accuracy is how close a measured value is to the actual (true) value.

准确率是测量值与实际（真）值的接近程度。

（2）Precision is how close the measured values are to each other.

精度是测量值彼此接近的程度。 ​​​​

Examples of Precision and Accuracy:

Low Accuracy High Precision	High Accuracy Low Precision	High Accuracy High Precision

So, if you are playing soccer and you always hit the left goal post instead of scoring, then you are not accurate, but you are precise!