准确度与精密度的区别

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

a

quantity

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

.

Although the two

words

can

be

synonymous

in

colloquial

use,

they

are

deliberately

contrasted

in

the

context of the

scientific method

.

[1]

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

< br>，这时测量数据比较集中，但

系统误差的

大小并不明确< /p>

。

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。