Mapping the diversity of maize races in Mexico.

Spearman's rank correlation for race frequency between the three collection efforts was highly significant for all cases (p<0.0001; Rho for 1950*1975 = 0.72, 1950*2005 = 0.63, and 1975*2005 = 0.73) and also between each of these efforts and the whole sample (p<0.0001; Rho 0.77, 0.86, and 0.95, respectively for 1950, 1975 and 2005).

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