“precision”的概念、定义、翻译、参考文献-科学参考

precision

Physics

The degree of agreement between repeated measurements of a physical quantity under the same conditions. Precise measurements are very important in science, because if such measurements disagree with theoretical expectations then the theory may require modification. In addition, precise measurements are very important in the determination of units for physical quantities. See also accuracy.

Chemical Engineering

A measure of the exactness of a measured quantity. Used in statistics, the precision may be increased by increasing the sample size. On a calculator, it is the number of significant figures to which a reading is taken: the greater the number of significant figures, the greater the precision. Compare accuracy.

Computer

The number of digits to which numbers are represented. For example, if p bits are allocated to the mantissa in the representation of floating-point numbers used in a particular computer, then in that computer floating-point numbers have p bits of precision. In general, the precision of floating-point numbers is proportional to their value (i.e. relative) whereas the precision of fixed-point numbers is absolute (independent of the value).
It is important not to confuse the term precision with accuracy. For example, the number
$3.142 8571$
has eight-decimal digit precision, irrespective of what it represents. If this number represents 22/7 then it is also accurate to eight decimal digits but if it represents the irrational number π‎ then it is accurate only to three decimal digits.

Internet

A metric used to quantify the success of a query made to a search engine.

Geology and Earth Sciences

See errors.

单词	precision
释义	precision Physics The degree of agreement between repeated measurements of a physical quantity under the same conditions. Precise measurements are very important in science, because if such measurements disagree with theoretical expectations then the theory may require modification. In addition, precise measurements are very important in the determination of units for physical quantities. See also accuracy. Chemical Engineering A measure of the exactness of a measured quantity. Used in statistics, the precision may be increased by increasing the sample size. On a calculator, it is the number of significant figures to which a reading is taken: the greater the number of significant figures, the greater the precision. Compare accuracy. Computer The number of digits to which numbers are represented. For example, if p bits are allocated to the mantissa in the representation of floating-point numbers used in a particular computer, then in that computer floating-point numbers have p bits of precision. In general, the precision of floating-point numbers is proportional to their value (i.e. relative) whereas the precision of fixed-point numbers is absolute (independent of the value). It is important not to confuse the term precision with accuracy. For example, the number $3.142 8571$ has eight-decimal digit precision, irrespective of what it represents. If this number represents 22/7 then it is also accurate to eight decimal digits but if it represents the irrational number π‎ then it is accurate only to three decimal digits. Internet A metric used to quantify the success of a query made to a search engine. Geology and Earth Sciences See errors.
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