The Excel file dap_exercises.xls contains 6 Daphnia magna
datasets from studies following OECD TG 211. For each dataset, do the
following: (i) Determine the NOEC using a normal errors test (Williams+Dunnett)
and Jonckheere– Terpstra test on the square‐root transform of TLY21 and
also without transform. (ii) Determine the NOEC using a Poisson errors model on
TLY21 with no transform using a Dunnett– Hsu test. (iii) Fit a normal errors
regression model to the data, if possible, and provide point and interval
estimates of EC10 and EC20. Evaluate the model for goodness of fit and stability.
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