Caratterizzazione di gruppi di reperti fittili della laguna di Venezia mediante analisi discriminante applicata ai dati chimici

Silvia Cavazzoni, Lorenzo Lazzarini, Giancarlo Taroni

«Archeologia e Calcolatori» 1993, 4, 113-125

Abstract

Multivariate discriminant analyses were applied to the chemical composition data of four groups of fictile archaeological findings from the lagoon of Venice. Three groups are constituted of ceramic fragments of different manufacture, local and imported Byzantine originating from different epochs, from the Middle Ages to the Renaissance. The fourth group is formed of special Middle Age bricks (“altinelle”). Our aim was to first find the chemical characteristic of each group and, on this basis, to classify other unidentified findings. After having verified the structure of the four groups by means of PCA analysis, three discriminant canonical variates were determined: the relative weights of the original variables represent their discriminant power. The groups were also analysed in pairs and their relative discriminating variables were found. Discriminant function on the basis of the three new variates were calculated for each of the four groups and used for their verification. Finally a quadratic PCA analysis was applied to the first two variates of each group allowing, by means of recognition of their geometric form, to also identify non-linear relationships.

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