Physical Sciences and Mathematics Commons^™

Composite Sampling Techniques For Determining Pesticide Concentrations, R. S. Parrish, G. O. Ware, C. N. Smith, P. A. Banks

Conference on Applied Statistics in Agriculture

Composite sampling techniques are compared with random sampling methods for determining pesticide concentrations in agricultural fields. Estimates of mean pesticide concentrations and associated standard errors are presented for different experimental conditions. Variance components defined in extended forms of the Brown-Fisher model are estimated. The method of nonlinear least squares was employed to obtain numerical estimates of variance components by equating observed mean squares to expected mean squares for appropriate sampling designs.