Determine the NOEC for the data in Table A13.2. Be sure to
explore normality and variance homogeneity of the residuals from ANOVA. For
Dunnett and Williams’ tests, the variance structure comes from treating
replicate and replicate X treatment as random effects. SAS and R programs are
provided in Appendix 1 that can be adapted easily to these data. The
Jonckheere–Terpstra test should be done on the replicate means. Also, try to
fit a useful regression model to the replicate means data and estimate EC10.

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