# CCA
Optimized Matlab code to perform Canonical Correlation Analysis for paleoclimate reconstructions
— **cca_master_example.m**: an example illustrating the workflow of climate field reconstructions using CCA. The example uses a pseudoproxy network, but the code can be generalized to use on any other datasets (including real-world proxies). The following functions are called within the master code:
— **cca_cfr.m**: implement CCA reconstructions, in which the CCA parameters are estimated using the cca_cv.m function
— **cca_cfr_parallel.m**: parallel the cca_cfr.m script. This is particularly useful when dealing with sparse matrices (i.e. matrices with missing values, for instance, a real-world proxy matrix). In cca_cfr_parallel.m, a set of CCA parameters is needed for each pattern of missing values. The script is coded to parallel the computation of CCA parameters of different patterns.
— **cca_cv.m**: estimate the set of CCA parameters using cross-validation (CV). By default, leave-half-out CV as implemented in Smerdon et al., 2010 is used.
— **cca_bp.m**: make predictions using CCA in the Barnett-Preisendorfer version (CCA-BP)
— **standardize.m**: a function that standardizes a matrix and return the standardized matrix and the original matrix’s mean and standard deviation.
##Reference:##
Wang, J., J. Emile-Geay, D. Guillot, J.E. Smerdon, and B. Rajaratnam, 2014: Evaluating climate field reconstruction techniques using improved emulations of real-world conditions, Clim., Past, 10, 1-19. http://www.clim-past.net/10/1/2014/cp-10-1-2014.html
Smerdon, J.E., A. Kaplan, D. Chang, and M.N. Evans, 2010: A pseudoproxy evaluation of the CCA and RegEM methods for reconstructing climate fields of the last millennium, J. Climate, 23, 4856-4880. http://rainbow.ldeo.columbia.edu/~alexeyk/Papers/Smerdon_etal2010CCApblshd.pdf
Please cite the following DOI when you use the code:
[![DOI](https://zenodo.org/badge/doi/10.5281/zenodo.32089.svg)](http://dx.doi.org/10.5281/zenodo.32089)
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