White marbles in Roman architecture: Electron paramagnetic resonance identification and bootstrap assessment of the results
| Autor: | Attanasio D., Platania R., Rocchi P. |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Journal of archaeological science 32(2) (2005): 311–319. info:cnr-pdr/source/autori:Attanasio D., Platania R., Rocchi P./titolo:White marbles in Roman architecture: Electron paramagnetic resonance identification and bootstrap assessment of the results/doi:/rivista:Journal of archaeological science/anno:2005/pagina_da:311/pagina_a:319/intervallo_pagine:311–319/volume:32(2) |
| Popis: | On the basis of a previously reported spectroscopic and petrographic database, a general procedure for determining the provenance of white marbles is presented and used to establish a classification rule for the marbles most used in Roman architecture. The rule, based on a data set including seven groups (Carrara, Naxos, Paros, Pentelicon, Proconnesus and Thasos, calcitic and dolomitic marbles) and 712 samples, uses quadratic discriminant analysis and a set of four spectroscopic and two petrographic variables, after logarithmic transformation. The performance of the rule, obtained by resubstitution, is 93.3%. Validation of this result, carried out using the bootstrap technique, after briefly introducing the method, indicates that the resubstitution bias is 1.4%, with a final unbiased performance of about 92%. The bootstrap result agrees satisfactorily with alternative bias estimates (jackknife, cross-validation). Problems connected with the assignment of sets of unknown samples and the methods used for distinguishing reliable from doubtful assignments are discussed. |
| Databáze: | OpenAIRE |
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