0. L. DAVIES Zmperial Chemical Zndustries Limited In establishing an economical testing program the costs of routine analytical tests must be weighed against losses due to shipping material which is either above or below stated specifications. A method for obtaining an optimum sampling and Read more
ROBERT M. DE BAUN Stamford Research Laboratories American Cyanamid Company Stamford, Connecticut Many experimental designs have been proposed for exploring an unknown response function using a second order approximating polynomial model. Second order experimental designs are described for the Read more
0. DYRSTRA, JR. General Foods Research Center Tarrytown, N. Y. Two level factorial and fractional factorial designs are described in which a subset of the treatment combinations are duplicated. The duplicate runs provide an unbiased estimate of the experimental error variance and more reliable Read more
JOHN W. TUKEY Princeton University A simple test for comparing two samples is proposed. If one sample contains the highest value and the other the lowest value of the two samples combined, the total of two counts is taken as the statistic. These counts are of(i) the number of individuals in the Read more
G. E. P. Box AND J. S. HUNTER Statistical Techniques Research Group Princeton University Evolutionary Operation is a method for operating plant processes. Since the method is applied by plant personnel themselves as a continuing normal part of process operation it is desirable to reduce the Read more