5. Use of Internal Laboratory Data
5.1 Modeling Approach
The modeling approach involves establishing a mathematical relationship—often based on a physical or chemical principle—between the measurand (output variable) and the various influencing variables (input variables).
It is divided into four steps:
Step 1: Modeling the measurement process (measurement model);
Step 2: Evaluation of characteristics (standard uncertainty, etc.) for each input variable;
Step 3: Estimation of the output quantity (measurand);
Step 4: Expressing the final result.
The historical intra-laboratory uncertainty evaluation procedure...
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Use of Internal Laboratory Data
Use of Data from Outside the Laboratory
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