Table 5 Average percent change in prediction accuracy of 10% and 20% diversity and prediction cores vs. prediction accuracy of random cross-validation TRN20-TST80 (first four columns) and percent change in prediction accuracy between 10% diversity core vs. 10% prediction core, and between 20% diversity core vs. 20% prediction core for traits measured in one or in two environments for Mexican and Iranian collections
Trait-Collectiona10% Diversity10% Prediction20% Diversity20% Prediction10% Diversity vs. 10% Prediction20% Diversity vs. 20% Prediction
Accounting for population structure
 One environment -Mexican collection8.010.32.71.22.4−1.6
 One environment -Iranian collection13.114.92.88.71.25.9
 Two environments -Mexican collection7.56.53.01.2−1.3−1.9
 Two environments -Iranian collection12.17.60.93.3−5.32.4
Not accounting for population structure
 One environment -Mexican collection4.14.70.90.90.6−0.1
 One environment -Iranian collection7.525.51.949.51.919.5
 Two environments -Mexican collection2.512.720.590.630.130.03
 Two environments -Iranian collection8.305.110.811.46−3.480.63
  • a Traits evaluated in one environment when accounting for population structure (from Table 2), traits evaluated in two environments when not accounting for population structure (from Table 4), traits evaluated in one environment when not accounting for population structure (from Table A1), traits evaluated in two environments when not accounting for population structure (from Table A3).