Currently,bottom-up technique based on GUM is the main method for the evaluation of measurement uncertainty.However,the main drawbacks of bottom-up technique that restricts its more frequent application in evaluation of uncertainty for chemical analysis is its complicated evaluation steps,subcomponents of measurement uncertainty could be easily omited or double-counted,and some subcomponents are difficult to quantify accurately.The quality assurance and control charting methods based on top-down technique,w...
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