Correia P. R. M., Ferreira M. M. C., "RECONHECIMENTO DE PADRÕES POR MÉTODOS NÃO SUPERVISIONADOS: EXPLORANDO PROCEDIMENTOS QUIMIOMÉTRICOS PARA O TRATAMENTO DE DADOS ANALÍTICOS". ["NON-SUPERVISED PATTERN RECOGNITION METHODS: EXPLORING CHEMOMETRICAL PROCEDURES FOR EVALUATING ANALYTICAL DATA"], Quim. Nova, 30(2), 481-487 (Mar-Apr 2007).
[Article]
 

Abstract.
An activity for introducing hierarchical cluster analysis (HCA) and principal component analysis (PCA) during the Instrumental Analytical Chemistry course is presented. The posed problem involved the discrimination of mineral water samples according to their geographical origin. Thirty-seven samples of 9 different brands were considered and the results from the determination of Na, K, Mg, Ca, Sr and Ba were taken into account. Non-supervised methods for pattern recognition were explored to construct a dendogram, score and loading plots. The devised activity can be adopted for introducing Chemometrics devoted to data handing, stressing its importance in the context of modern Analytical Chemistry.

Keywords.
Analytical Chemistry; Chemometrics; Pattern Recognition.

Keywords Plus.