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precision measurement

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1) "Precision" -- As to precision measurement 1pre·ci·sion Pronunciation: pri-'si-zh&n Function: noun 1 : the quality or state of being precise : EXACTNESS 2 a : the degree of refinement with which an operation is performed or a measurement stated -- compare ACCURACY 2b b : the accuracy (as in binary or decimal places) with which a number can be represented usually expressed in terms of the number of computer words available for representation <double precision arithmetic permits the representation of an expression by two computer words> 3 : RELEVANCE 2 - pre·ci·sion·ist /-'si-zh&-nist, -'sizh-nist/ noun Pronunciation Symbols Precision has the following meanings: In engineering, science, industry and statistics, precision characterises the degree of mutual agreement among a series of individual measurements, values, or results – see accuracy and precision. In computing, one of: the precision (number of digits) with which a value is expressed (e.g., the number of significant decimal digits or bits – a calculation which rounds to three digits is said to have a working precision or rounding precision of 3) the units of the least significant digit of a measurement; for example, if a measurement is 17.130 meters then its precision is millimeters (one unit in the last place, or ulp, is 1 mm) (in some programming languages and databases) the number of decimal places after the decimal point in a fixed-point number; to avoid confusion, this usage is best avoided. With respect to a set of independent devices of the same design, precision is the ability of these devices to produce the same value or result, given the same input conditions and operating in the same environment. (As defined by Federal Standard 1037C and MIL-STD-188.) With respect to a single device, put into operation repeatedly without adjustments, precision is the ability to produce the same value or result, given the same input conditions and operating in the same environment. (As defined by Federal Standard 1037C and MIL-STD-188.) In information retrieval, is the percentage of documents returned that are relevant. It forms a natural pair with recall. In music, "Precision" is the official march of the Royal Military College of Canada The Precision club bidding system in the game of contract bridge. ..." 2) "Measurement" -- As to precision measurement mea·sure·ment Pronunciation: 'me-zh&r-m&nt, 'mA- Function: noun 1 : the act or process of measuring 2 : a figure, extent, or amount obtained by measuring : DIMENSION 3 : MEASURE 2b Pronunciation Symbols Various meters Measurement is the estimation or determination of extent, dimension or capacity, usually in relation to some standard or unit of measurement. The measurement is expressed as a number of units of the standard (a real number times a unit), such as distance being indicated by a number of miles or kilometers. The process of measuring involves estimating the ratio of the magnitude of a quantity to the magnitude of a unit of the same type (e.g. length, time, mass, etc.). A measurement is the result of such a process, expressed as the product of a real number and a unit, where the real number is the estimated ratio. An example is 9 metres, which is an estimate of an object's length relative to a unit of length, the metre. Unlike a count, or integer quantity of items that is known exactly, every measurement is an estimate that has some uncertainty.(See Metrology). Also, two distinctly different qualities of measurement, not often recognized, and thus the cause of confusion, are the Marker (digital) and the Span (analogical), or the Unit (digital) and the Quantity (analogical). If apples cost a dollar apiece, you can buy one apple for one dollar (Digital, and exact. If they cost a dollar a pound, you have to find a one pound apple or two half pound apples (or so), if you want to spend exactly one dollar, which is analogic, and inexact, the real world is analogic, not digital. As mentioned above, there are no exact quantities, only approximations, except when we agree otherwise. With time:- seconds, minutes, and hours are Markers, and digital, yet days, months and years are Spans, and analogic, Except:- Years AD or CE are Spans (whole years, Anno Domini 2007 means "in the year of our Lord, 2007, which proposes that Jesus is 2006 years old and in his 2007th year, (analog), but years BC or BCE are Markers (5 BC is a Marker, not a whole year, digital). 1 Overview 1.1 Other uses of the term 2 History 3 Units and systems of meas..." 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