1. What is the linearity of a measurement method?
According to EEC Explanatory Note III/844/87, the linearity of a measurement method is its ability, within a certain interval (measurement range), to obtain measurement results directly proportional to the amount (e.g. concentration) of substance in the sample analyzed.
In practice, this means that if we introduce a theoretical data item x on several levels, the measurement process will give us a proportional response y for each of the levels. This is the case of a calibration range, for example.
Following a calibration, we have three pieces of information:
a variable x: value s introduced s known s (standard) ;
a variable y: response s obtained by the s measurement method from x ;
a relationship between these variables, known...
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What is the linearity of a measurement method?
Bibliography
P.H. Cornillon, E.M. Lober, Regression – Theory and application , Ed Springer
Collège Français de Métrologie (CFM): "Application of the new VIM 3 calibration concept" and the associated M-CARE processing software, downloadable from the CFM website
Normative reference
Standard NF T 90-210 "Qualité de l'eau – Protocol for the initial evaluation of the performance of a method in a laboratory".
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