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J Health Info Stat > Volume 36(2); 2011 > Article
J Health Info Stat 2011;36(2):183-193.
스펙트럼 분석을 통한 구기자 원산지 분류모형 연구
이성임 , 정우호 , 권성원 , 임요한 , 김상철
A Study on Classification Model of Boxthron Origin
Sung Im Lee , Woo Ho Chung , Won Sung Kwon , Jo Han Lim , Sung Cheol Kim
The origin of medicinal herbs is crucial to quality control. We aimed to find statistical model to discriminate the origin of boxthron.
We used three types of methods for choosing meaningful variables that to predict the origin of boxthron: standardization, binning, variable selection. Firstly we used LRPC (Iogistic regression model with principal components) and PLSR (partial least square regression) model to discriminate the origin of spectrum pattern, and then figured chemical substance out.
We compared prediction power of alternative models according to three factors: variable selection, standardization and modeling. Variable selection method was worse than modeling using all variables. An error rate of the first type of standardization showed the best results among three standardization types. PLSR lower rate of error compared to LRPC. Optimized model, through LOOCV (leave and out cross validation), predicted the time that find out Boxthron origin, and also differentiated the orogin of Boxthron by Glycerol (14.3 seconds) and malic acid (23.18 seconds).
We identified and suggested statistical model to discriminate the origin of boxthron by simulation. However, further research is needed to enhance the rate of prediction.
Key words: Spectrum, Partial least square regression, Logistic regression model with principal components, Leave and out cross validation
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