Definition

Minitab: Coefficient of determination; indicates how much variation in the response is explained by the model. The higher the R2 , the better the model fits your data.

Definition

ISO 3534: Sample which has been selected by a method of a random selection.

Definition

ISO 3534: Sample which has been selected by a method of a random selection.

Definition

Guide EURACHEM: The fraction of analyte added to a test sample (fortified or spiked sample) prior to analysis, the unfortified and fortified samples.

Definition

Guide EURACHEM: Material or substance one or more of whose property values are sufficiently homogeneous and well established to be used for the calibration of an apparatus, the assessment of a measurement methode, or for assigning values to materials.

Definition

MSA: Accepted value of an artifact, which requires an operational definition. Used as the surrogate for the true value.

Definition

This term is used to describe a group of method that summarize the degree of association between one variable (or set of variables) and another variables (or set of variables). The most common statistical method used to do this is the least squares regression, which works by finding the "best curve" through the data that mimizes the sums of square residuals.

Definition

MSA: A statistical study of the relationship between two or more variables. A calculation to define the mathematical relationship between two or more variables.

Definition

Le coefficient de variation CV est un nombre sans dimension, exprimé en %, donnant le pourcentage que représente l'écart-type sur la moyenne. Le CV a pour interêt de permettre la comparaison entre les fluctuations relatives de variables de natures différentes.

Definition

ISO 5725: Fidélité sous des conditions de répétabilité

Definition

ICH: Repeatability expresses the precision under the same operating conditions over a short interval of time. It is also termed intra-assay precision.

MSA: Variation in measurements obtained with one measuring instrument when used several times by an appraiser while measuring a characteristic on the same part. The variation in successive (Short term) trials under fixed and defined conditions of measurement.

Definition

ISO 3534-2:2006: r

repeatability critical difference for a specified probability of 95 %

Definition

6 sigma: Repeated experimental trials that are made under identical factor levels and in similar conditions.

Definition

TS 16949: Multiple test trials under repeatability (identical) conditions.

Definition

ICH: It expresses the precision between laboratories (collaboratives studies, usually applied to standardization of methodology).

MSA: Variation in the average of the measurements made by different appraisers using the same gage when measuring a characteristic on one part.

Definition

ISO 5725: Ecart-type maximal (au niveau de confiance de 95%) entre deux résultats obtenus sur un échantillon commun par deux opérateurs ou deux laboratoires (au moins) selon des conditions de reproductibilté.

Definition

A residual value is calculated by taking the difference between the predicted value and the actual value. It can also be used to highlight points of influence (see bias, leverage and outliers).

Definition

Minitab: The difference between the observed values and predicted or fitted values (data minus fits). This part of the observation is not explained by the fitted model.

Definition

ISO 5725: Valeur d'un caractère obtenue par l'application d'une méthode d'essai spécifiée

Definition

Guide EURACHEM: Value attributed to a measurand, obtained by measurement.

Definition

ISO 5725: Mesure de sa capacité à ne pas être affectée par des petites variations des conditions opératoires.

Definition

ICH: It is a measure of its capacity to remain unaffected by small, but deliberate variations in method parameters and provides an indication of its reliability during normal usage.

Definition

ICH: It is the interval between the upper and lower concentration of analyte in the sample (including these concentrations), for which it has been demonstrated that the analytical procedure has a suitable level of precision, accuracy and linearity.

6 sigma: The difference between the largest and smallest observations in a data set.