A Screening Method for Increasing Acceptable Product with Some Parameters Unknown

The problem is considered of screening on a random variable correlated with the performance variable to increase acceptable product. Consider a stockpile with a given proportion meeting a set quality standard and the necessity to upgrade the stockpile by testing on a variable correlated with the variable of interest. For example, stcppose lifetime is the variable of interest. Clearly it would be useless to try to screen on the lifetime variable itself. However, if a variable correlated with lifetimes is available and a bivariate normal model is assumed then much can be done. If all of the paramctcrs are known, the solution is given by Owen, McIntire and Seymour [12], but if some of the parameters are unknown then some procedures for handling the problem are given here. Ptlost of the previous work in the area of selection by a correlated variate is concerned with personnel selection and animal improvement. As such, it is widely scattered. Fol example, Owen [9], p. XLIV, contains a bibliography which contai...