In multivariate analysis, canonical correspondence analysis (CCA) is an ordination technique that determines axes from the response data as a unimodal combination of measured predictors. CCA is commonly used in ecology in order to extract gradients that drive the composition of ecological communities. CCA extends Correspondence Analysis (CA) with regression, in order to incorporate predictor variables.
History
editCCA was developed in 1986 by Cajo ter Braak [1] and implemented in the program CANOCO, an extension of DECORANA.[2] To date, CCA is one of the most popular multivariate methods in ecology, despite the availability of contemporary alternatives.[3] CCA was originally derived and implemented using an algorithm of weighted averaging, though Legendre & Legendre (1998) derived an alternative algorithm.[4]
Assumptions
editThe requirements of a CCA are that the samples are random and independent. Also, the data are categorical and that the independent variables are consistent within the sample site and error-free.[5] The original publication states the need for equal species tolerances, equal species maxima, and equispaced or uniformly distributed species optima and site scores.[1]
See also
edit- Canonical correlation analysis (CANCOR)
References
edit- ^ a b ter Braak, Cajo J. F. (1986). "Canonical Correspondence Analysis: A New Eigenvector Technique for Multivariate Direct Gradient Analysis". Ecology. 67 (5): 1167–1179. doi:10.2307/1938672. JSTOR 1938672.
- ^ Braak, Cajo J. F. ter (2014), "History of Canonical Correspondence Analysis", Visualization and Verbalization of Data, pp. 103–118, doi:10.1201/b16741-11, ISBN 9780429167980, retrieved 2022-07-20
- ^ Yee, Thomas W. (2004). "A New Technique for Maximum-Likelihood Canonical Gaussian Ordination". Ecological Monographs. 74 (4): 685–701. doi:10.1890/03-0078. ISSN 0012-9615.
- ^ Legendre, P.; Legendre, L. (2012-07-21). Numerical Ecology. Elsevier. ISBN 978-0-444-53869-7.
- ^ McGarigal, K., S. Cushman, and S. Stafford (2000). Multivariate Statistics for Wildlife and Ecology Research. New York, New York, USA: Springer.
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