Models for Curve-fitting Herbicide Dose Response Data

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Abstract
Due to the biological effect of s-triazines, the commonly used logit transformation and non-linear regression analysis, are inadequate in describing dose response curves from short term bioassay experiments. On the basis of theoretical considerations a modified log-logistic equation was fitted to bioassay data, and the goodness of fit was assessed in relation to an analysis of variance. The regression model proposed provides an estimate of herbicide potency and its standard error.