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Statistical Analysis of Field Trials with Changing Treatment Variance

^a Agro-Tech, Inc., Velva, ND, 58790
^b Statistical Advisory & Training Service Pty Ltd, Sydney, NSW, Australia

View larger version (11K): [in this window] [in a new window]   Fig. 1. Dry weights (A), and log-transformed dry weights (B), of lettuce seedlings over the first 35 d after transplanting.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Standardized residual plots from (A) standard ANOVA of the turnip yields, (B) weighted ANOVA of the turnip yields, with weights inversely proportional to the densities, (C) standard ANOVA of log-transformed turnip yields, and (D) a linear mixed model (LMM) (Residual Maximum Likelihood, REML) analysis with variances changing across sowing dates and sowing densities.