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Kernel Models*Universidad de Quintana Roo, Chetumal, Quintana Roo, 77019 M ico, Biometrics and Statistics Unit, International Maize and Wheat Improvement Center (CIMMYT), 06600 M ico D. F., M ico, Facultad de Telem ica, Universidad de Colima, C. P. 28040, Edo. de Colima, M ico, �Colegio de Postgraduados, C. P. 56230 Montecillos, Edo. de M ico, M ico, and **Department of Epidemiology and Biostatist



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