Listy Biometryczne – Biometrical Letters, Vol. 41 (2004), No.1, 1-13


Show full-size cover
COMPARISON, THROUGH MULTIPLE FACTOR ANALYSIS, OF TREATMENTS FOR CORK OAK SUDDEN DEATH.

Manuela M. Oliverira1, Luis Ramos2 and Joăo T. Mexia2

1Departamento de Matemática, Universisade de Évora, Colégio Luis António Verney, Rua Romăo Ramalho 59, 7000 Évora, Portugal;
2Departamento de Matemática, Faculdade de Cięncias e Tecnologia, Universidade Nova de Lisboa, Quinta da Torre, 2825 Monte da Caparica, Portugal


Multiple Factor Analysis (MFA) uses a set of simultaneonly observed qualitative variables to analyse complex situations. The main features of MFA are presented. The part played by modalities, that is, dummy variables associated to the original qualitative variables, and of the corresponding principal components, is presented. The relationship between these principal components and the initial qualitative variables is discussed. Treatments for cork oak plantations suffering from serious disease called sudden death are comparet through the use od MFA. This technique enables a global treatment of the information available and gives a clear ranking of the treatments according to their effectiveness.


cork oak, multiple factor analysis, sudden death.