| 光谱学与光谱分析 |
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| Gaussian Process Regression and Its Application in Near-Infrared Spectroscopy Analysis |
| FENG Ai-ming，FANG Li-min，LIN Min* |
| College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China |
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Abstract Gaussian process (GP) is applied in the present paper as a chemometric method to explore the complicated relationship between the near infrared (NIR) spectra and ingredients. After the outliers were detected by Monte Carlo cross validation (MCCV) method and removed from dataset, different preprocessing methods, such as multiplicative scatter correction (MSC), smoothing and derivate, were tried for the best performance of the models. Furthermore, uninformative variable elimination (UVE) was introduced as a variable selection technique and the characteristic wavelengths obtained were further employed as input for modeling. A public dataset with 80 NIR spectra of corn was introduced as an example for evaluating the new algorithm. The optimal models for oil, starch and protein were obtained by the GP regression method. The performance of the final models were evaluated according to the root mean square error of calibration (RMSEC), root mean square error of cross-validation (RMSECV), root mean square error of prediction (RMSEP) and correlation coefficient (r). The models give good calibration ability with r values above 0.99 and the prediction ability is also satisfactory with r values higher than 0.96. The overall results demonstrate that GP algorithm is an effective chemometric method and is promising for the NIR analysis.
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Received: 2010-08-17
Accepted: 2010-11-15
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Corresponding Authors:
LIN Min
E-mail: linm@cjlu.edu.cn
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