NF EN ISO 20988
Air Quality - Guidelines for estimating measurement uncertainty
ISO 20988:2007 provides comprehensive guidance and specific statistical procedures for uncertainty estimation in air quality measurements including measurements of ambient air, stationary source emissions, indoor air, workplace atmospheres and meteorology. It applies the general recommendations of the Guide to the Expression of Uncertainty in Measurement (GUM) to boundary conditions met in air quality measurement. The boundary conditions considered include measurands varying rapidly in time, as well as the presence of bias in a series of observations obtained under conditions of intended use of methods of air quality measurement. The methods of measurement considered comprise methods corrected for systematic effects by repeated observation of reference materials, methods calibrated by paired measurement with a reference method, methods not corrected for systematic effects because they are unbiased by design, and methods not corrected for systematic effects in intended use deliberately taking into account a bias. Experimental data for uncertainty estimation can be provided either by a single experimental design in a direct approach or by a combination of different experimental designs in an indirect approach.
ISO 20988:2007 provides comprehensive guidance and specific statistical procedures for uncertainty estimation in air quality measurements including measurements of ambient air, stationary source emissions, indoor air, workplace atmospheres and meteorology. It applies the general recommendations of the Guide to the Expression of Uncertainty in Measurement (GUM) to boundary conditions met in air quality measurement. The boundary conditions considered include measurands varying rapidly in time, as well as the presence of bias in a series of observations obtained under conditions of intended use of methods of air quality measurement.
The methods of measurement considered comprise methods corrected for systematic effects by repeated observation of reference materials, methods calibrated by paired measurement with a reference method, methods not corrected for systematic effects because they are unbiased by design, and methods not corrected for systematic effects in intended use deliberately taking into account a bias.
Experimental data for uncertainty estimation can be provided either by a single experimental design in a direct approach or by a combination of different experimental designs in an indirect approach.
- Avant-proposiv
- Introductionv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions1
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4 Symboles et abréviations5
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5 Concepts fondamentaux7
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5.1 Lignes générales7
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5.2 Incertitude de mesurage8
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5.3 Correction des effets systématiques10
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5.4 Fourniture des données d'entrée11
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6 Définition de problème13
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6.1 Objectifs13
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6.2 Mesurage14
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6.3 Paramètres d'incertitude15
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6.4 Données d'entrée15
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6.5 Effets non décrits par les séries d'observations17
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7 Analyse statistique18
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7.1 Objectives18
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7.2 Approche indirecte20
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7.3 Approche directe21
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7.4 Validité statistique22
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8 Estimation des variances et covariances23
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8.1 Généralités23
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8.2 Estimations de la variance de Type A23
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8.3 Estimations de la variance de Type B24
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8.4 Estimation des covariances24
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9 Évaluation des paramètres d'incertitude26
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9.1 Objectif26
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9.2 Incertitude type composée26
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9.3 Incertitude élargie27
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10 Rapport29
- Annexe A (informative) Essai de probabilité d'élargissement30
- Annexe B (informative) Méthodes d'évaluation de Type A pour les programmes expérimentaux A1 à A834
- Annexe C (informative) Exemples49
- Bibliographie82
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