Racine would like to gratefully acknowledge support from the Natural Sciences and Engineering Research Council of Canada (NSERC: www.nserc.ca), the Social Sciences and Humanities Research Council of Canada (SSHRC: www.sshrc.ca), and the Shared Hierarchical Academic Research Computing Network (SHARCNET: www.sharcnet.ca). Hansen thanks the National Science Foundation and the Phipps Chair for research support. We would like to thank but not implicate James MacKinnon, Rob Hyndman, and In Choi for their insight and encouragement.

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