The degree in which a search engine lists documents matching a query The more matching documents that are listed, the higher the precision For example, if a search engine lists 80 documents found to match a query but only 20 of them contain the search words, then the precision would be 25%
refers to the level of measurement and exactness of description in a GIS database Precise locational data may measure position to a fraction of a unit Precise attribute information may specify the characteristics of features in great detail It is important to realize, however, that precise data--no matter how carefully measured--may be inaccurate Surveyors may make mistakes or data may be entered into the database incorrectly Therefore, a distinction is made between precision and accuracy
the degree of refinement in the performance of an operation, or the degree of perfection in the instruments and methods used when making measurements An indication of the uniformity or reproducibility of a result Precision relates to the quality of an operation by which a result is obtained, and is distinguished from accuracy, which relates to the quality of the result
If you do something with precision, you do it exactly as it should be done. The interior is planned with a precision the military would be proud of. the quality of being very exact or correct with precision
The number of digit bits used by an ADC to represent an analog signal The more digits used, the higher the precision and the closer the digital representation will be to the actual value
A measure of whether the documents returned in an information retrieval process are relevant to the query For example, if eighty percent of the documents returned by a query are relevant (and the remaining 20 percent are not) then precision is 80
The number of decimal places to which a value is given This usually far exceeds its accuracy For example, a GIS might give the coordinate of a point location for building to ten decimal places providing a value that is precise to fractions of a centimetre In reality this value may only be accurate to the nearest ten meters
the quality of being reproducible in amount or performance; "he handled it with the preciseness of an automaton"; "note the meticulous precision of his measurements"
The degree to which replicate measurements of the same attribute agree or are exact "The degree to which a set of observations or measurements of the same property, usually obtained under similar conditions, conform to themselves; a data quality indicator" (QAMS 1993, 16) (See related: accuracy, bias )
In information retrieval, the percentage of hits found by a search that satisfy the request that generated the query
The degree of mutual agreement among a series of individual measurements Precision is often, but not necessarily, expressed by the standard deviation of the measurements
Refers to the number of significant digits used to store numbers, and in particular, coordinate values Precision is important for accurate feature representation, analysis and mapping ArcInfo supports single precision and double precision
The extent to which an estimate agrees with its mean value in repeated sampling The precision of an estimate is measured inversely by its standard error (SE) or relative standard error (RSE) In DAWN publications, estimates with an RSE of 50 percent or higher are regarded as too imprecise to be published ED table cells where such estimates would have appeared contain the symbol "…" (3 dots) (See also Relative standard error )
The precision of an estimate of a parameter in a model is a measure of how variable the estimate would be over other similar data sets A very precise estimate would be one that did not vary much over different data sets Precision does not measure accuracy Accuracy is a measure of how close the estimate is to the real value of the parameter Accuracy is measured by the average distance over different data sets of the estimate from the real value Estimates can be accurate but not precise, or precise but not accurate A precise but inaccurate estimate is usually biased, with the bias equal to the average distance from the real value of the parameter
Precision is a statistical measurement of repeatability that is usually expressed as a variance or standard deviation, root mean square or RMS, of repeated measurements These are expressed as x,y coordinates of arcs, label points, and tics in either single or double precision in ARC/INFO Single-precision coordinates have up to seven significant digits of precision This allows for a level of accuracy of approximately 10 meters for a region whose extent is 1,000,000 meters across Double-precision coordinates have up to 15 significant digits; this allows for the precision necessary to represent any desired map accuracy at a global scale