Abstract

For a variety of reasons, bioassay experiments are frequently conducted with small sample sizes. However, the statistical literature offers little comparative information for small sample sizes among the analytical procedures most typically applied in vertebrate studies for chemical registration. A simulation study was performed to compare several traditional analytical procedures for estimating the median lethal dose (LD50). These estimation procedures include probit analysis with maximum likelihood estimation, logit analysis with maximum likelihood and minimum chi-square estimation methods, and analysis by a nonparametric moving average procedure. The simulation results indicate the conditions under which each analytical method appears most useful. Recommendations are tentatively made for minimally adequate designs for bioassay studies.

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