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TERMINOLOGY DATABASE
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IATE Terminology

Statistics · SCIENCE
ga diall caighdeánach REFERENCE Faomhadh an téarma seo mar chuid de Thionscadal Lex
en SD | S.D. | standard deviation
DEFINITION measure of how close or how far data points are from their average, or deviates from the mean - which, in a data sample, is estimated as the positive square root of the sum of the squares of the deviations between the observations and the mean of the data, divided by one less than the total number of observations REFERENCE COM-EN, based on: <BR>IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8 http://goldbook.iupac.org/S05911.html [4.12.2009]
COMMENT The standard deviation is the positive square root of the <i>variance</i> [ IATE:1681483 ]. <BR>The variance and the closely-related standard deviation are measures of how spread out a distribution is. In other words, they are measures of variability.<BR>The variance is computed as the average squared deviation of each number from its mean.
fr écart type | déviation standard
DEFINITION c'est la racine carrée de la moyenne des carrés pris par rapport à la moyenne arithmétique ;racine carrée de la variance de la population ou de l'échantillon  REFERENCE ISO/R 1213-2:1971
de Standardabweichung
DEFINITION positive Quadratwurzel aus der Varianz, die wiederum dem Erwartungswert des Quadrats der zentrierten Zufallsgröße entspricht REFERENCE DIN V ENV 13005:1999: Leitfaden zur Angabe der Unsicherheit beim Messen, S. 43
Statistics · SCIENCE
ga diall caighdeánach eimpíreach REFERENCE Faomhadh an téarma seo mar chuid de Thionscadal Lex
fr écart-type empirique | déviation standard empirique
DEFINITION racine carrée positive de la variance REFERENCE NF X 06-003:1971
Statistics · SCIENCE · Chemistry
ga diall caighdeánach coibhneasta REFERENCE Faomhadh an téarma seo mar chuid de Thionscadal Lex
en relative standard deviation | RSD
DEFINITION the absolute value of the coefficient of variation ( IATE:1594321 ) REFERENCE Wikipedia http://en.wikipedia.org/wiki/Relative_standard_deviation [8.12.2009]
COMMENT It is a measure of a statistical estimate's reliability obtained by dividing the standard error by the estimate; then multiplied by 100 to be expressed as a percent.<BR>In analytical chemistry is widely used for comparing the uncertainty between different measurements of varying absolute magnitude. It can be calculated with the formula: s<sub>r</sub> = s/x ̄<BR>
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