Correction regularities revealed

EPA round robin studies is another quality assessment tool that is effective in revealing deficiencies in laboratory s ability to correctly identify and quantify environmental pollutants. The EPA performs these studies on a regular schedule and evaluates the results for the purpose of establishing interlaboratory precision, which is a measure of variability among the results obtained for the same sample at different laboratories. (Interlaboratory precision or reproducibility is another secondary DQI.)... 

Periodic management review is a specific risk-based process safety (RBPS) element Providing regular checkups on the health of process safety management systems—including the metrics—will identify and correct any current or incipient deficiencies before they are revealed by an audit or incident. Such management reviews also demonstrate management interest and commitment to process safety and the metrics that describe the system. 

It can be seen from Table 10.1 that the relationship between trace element contents and the hypertension seems not very clear if the content of any single trace element is considered, but some regularities can be revealed by multivariate analysis. By Fisher method, the rate of correct separation of the sample points of two classes is 83%, and the rate of correcmess of prediction by leave-one-out (LOO) cross-validation method is 81.1%. The rate of correct prediction by KNN method is 77.3%. 

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