Fig. 3 Plot of the natural logarithms of mean square error (MSe) vs. trial mean for 49 alfalfa cultivar trials. The solid line is the linear regression of the plotted data points: ln(MSe) = 0.4719ln(Mean) - 1.3931 (P < 0.01). The dashed and dotted lines are the decision rules for rejecting trials based on the predicted MSe or coef. of variation (CV), respectively. Open vs. closed symbols are based on the P-value from the F-test for cultivar means

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