Appendix B. Type I error in simulations involving n = 144 (Fig. B1) and n = 36 (Fig. B2) experimental units.


FIG. B1. Rate of Type I error in simulations involving n = 144 experimental units after 1000 simulations. The rows of diagrams contain the results for the 6 experimental designs, numbered 1 to 6. Lefthand column: results for simple ANOVA. Middle and righthand column: results for ANOVA taking blocking into account, statistics F1 and F2. The 4 types of environmental surfaces are represented by symbols. Abscissa: ranges of values of spatial autocorrelation (SA) in the environmental (Envir.) and response variables (Resp.). Asterisks: rejection rates whose confidence intervals do not include the significance level (alpha = 0.05). Original image available for download as "Fig_B1.gif". Reduce figure to 25% in Page Setup before printing.



FIG. B2. Rate of type I error in simulations involving n = 36 experimental units after 1000 simulations. The rows of diagrams contain the results for the 6 experimental designs, numbered 1 to 6. Lefthand column: results for simple ANOVA. Middle and righthand column: results for ANOVA taking blocking into account, statistics F1 and F2. The 4 types of environmental surfaces are represented by symbols. Abscissa: ranges of values of spatial autocorrelation (SA) in the environmental (Envir.) and response variables (Resp.). Asterisks in panels 1–4: rejection rates whose confidence intervals do not include the significance level (alpha = 0.05). Original image available for download as "Fig_B2.gif". Reduce figure to 25% in Page Setup before printing.
