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PNNL-13501 - Pacific Northwest National Laboratory

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a) Traditional PCA-based process control<br />

1<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

0<br />

0 5 10 15<br />

Pure culture<br />

20 25 30<br />

Contamination<br />

35 40 45 50<br />

b) <strong>PNNL</strong> Approach (CUSUM Test Statistic)<br />

5<br />

Sample Number<br />

4<br />

3<br />

2<br />

1<br />

Pure culture Contamination<br />

0<br />

0 5 10 15 20 25 30 35 40 45 50<br />

Sample Number<br />

Figure 2. <strong>PNNL</strong> developed quality control of mass spectral<br />

data. The approach (b) detects simulated sample<br />

contamination where the traditional approach (a) fails.<br />

and a wider variety of data types, along with the extension<br />

of this probabilistic model to multi-dimensional analytical<br />

instrumentation needs to be investigated.<br />

References<br />

Johnson RA and DW Wichern. 1992. Applied<br />

Multivariate Statistical Analysis. 3rd ed.; Prentice Hall,<br />

Englewood Cliffs, New Jersey.<br />

Nijhuis A, SD Jong, and BGM Vandegiste. 1997.<br />

“Multivariate process control in chromatography.”<br />

Chemometrics and Intelligent <strong>Laboratory</strong> Systems,<br />

38:51-62.<br />

Seber GAF. 1984. Multivariate Observations. John<br />

Wiley & Sons, Inc., New York.<br />

Statistics 453

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