Physical Sciences and Mathematics Commons^™

A Comparison Of Multiple Testing Methods: Spinosad As A Treatment For Lice On Cattle, Zhanglin Cui, Daniel H. Mowrey, Alan G. Zimmermann, Douglas E. Hutchens

Conference on Applied Statistics in Agriculture

A common problem in statistics is making multiple tests of hypotheses without controlling for the type I error rate. SAS has identified several different methods to adjust p-values for multiple testing. To compare the effect of these methods, an animal health dataset that deals with the treatment of cattle lice was examined. Clinical trials were conducted in Illinois and Wisconsin to evaluate the efficacy of two formulations of a new product Spinosad, two commercially available positive controls, and an untreated negative control. A baseline lice count was recorded prior to the treatment. After treatment, weekly measurements of lice counts were …