Appendix 2 Chlorpyrifos Species Sensitivity Distribution Analysis for Fish



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Figure B 2-6.2. SSDs for freshwater (log-normal), saltwater (log-triangular), and combined (log-normal) vertebrate LC50s for Chlorpyrifos. [Red lines show the upper and lower confidence interval for freshwater vertebrates. Blue lines show the upper and lower confidence interval for saltwater vertebrates]



Figure B 2-6.3. SSDs for freshwater vertebrates (log-normal), saltwater vertebrates (log-gumbel), and amphibian (log-triangular) LC50s for Chlorpyrifos. [Red lines show the upper and lower confidence interval for freshwater fish. Blue lines show the upper and lower confidence interval for amphibians]

IV. Goodness-of-fit
Plots of the cumulative distribution functions for the best-fit distributions (as determined by AICc) suggest little evidence of lack-of-fit (Figs. B 2-6.4, 5, 6, 7 and 8). Similarly, bootstrap goodness-of-fit tests did not show evidence for lack-of-fit (P-values > 0.05, Tables B 2-6.9, 10, 11, 12 and 13), with the exception of the Burr distribution, which frequently showed significant lack-of-fit. In general, the coefficient of variation for the HC05 was below 1 for the competitive distributions.



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