Instability in Principal Component Analysis and the Quantification of Polyphenism in Palaeontological Data |
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Authors: | Richard A Reyment |
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Institution: | (1) Paleozoologiska avdelningen, Naturhistoriska Riksmuseet, Box 50007, 10405 Stockholm, Sweden |
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Abstract: | The occurrence of cryptic polyphenism (variation in morphological properties within a single species) in ammonites is used to exemplify the application of the multivariate set of techniques known in analytical chemistry as cross-validation to quantify and isolate deviating specimens (ecomorphs) in a genetically homogeneous sample. A byproduct of the analysis bears on a method of identifying redundant variables. A species of Nigerian Turonian (Cretaceous) ammonites of the genus Thomasites is used in the exemplification. |
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Keywords: | cross-validation principal component analysis ecomorphs ammonites |
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