... Analysis¹

Available from http://GKing.Harvard.Edu/readme under the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License, for academic use only. Special thanks to Anton Strezhnev for assistance with making ReadMe compatible with Python 3.0.

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... Hopkins²

Institute for Quantitative Social Science, 1737 Cambridge Street, Harvard University, Cambridge MA 02138; www.danhopkins.org,dhopkins -at- fas.harvard.edu

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... King³

Institute for Quantitative Social Science, 1737 Cambridge Street, Harvard University, Cambridge MA 02138; http://GKing.Harvard.Edu, King -at- Harvard.Edu, (617) 495-2027.

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... Knowles⁴

Institute for Quantitative Social Science, 1737 Cambridge Street, Harvard University, Cambridge MA 02138; MKnowles -at- Fas.Harvard.Edu, (617) 384-5747.

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... Melendez⁵

Institute for Quantitative Social Science, 1737 Cambridge Street, Harvard University, Cambridge MA 02138; melend -at- Fas.Harvard.Edu, (617) 384-5747.

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