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

準確率accuracy 和 精度precision 的不同：

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

準確率是測量值與實際（真）值的接近程度。

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

精度是測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!

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