5. What are the "key" modeling points?
We can accept that the conditions for applying regression techniques have not been met, but we must nevertheless take a few precautions:
5.1 The meaning of the model
When estimating parameters, it is imperative to choose as x-values those known with the least uncertainty (these are not always the standard values). When daughter solutions are produced by diluting a mother solution, it is not uncommon for the uncertainties associated with the dilutions (and highly correlated with each other) to be greater than the uncertainties in the reading (in the case of optical densities, for example). In this way, the model is sometimes directly in the right direction (from y to x ), sometimes in the wrong direction (from x to y ). In the latter case, the estimated model...
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What are the "key" modeling points?
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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
ToolNormative 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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