THE article in this issue of ANESTHESIOLOGY by O'Hara et aL1 provides a good opportunity to review different clinical study designs and statistical issues associated with analyzing data from randomized and nonrandomized comparative studies. Statistics are necessary to analyze clinical data because the response to intervention usually varies widely among patients.' Most biostatisticians favor th...

UNLABELLED Human immunodeficiency virus (HIV) Western Blot (WB) tests are used as an aid in the diagnosis of acquired immunodeficiency disease syndrome (AIDS) and related disorders. The object of this study is to examine and compare the results of four commercially available HIV WB methods. Sera from 974 persons were tested by four (Kits I, II, III, and IV) HIV WB methods from different vendors...

inventory control is one of the most important issues in supply chain management. in this paper, a three-echelon production, distribution, inventory system composed of one producer, a set of wholesalers and retailers is considered. costumers' demands can be approximated by a normal distribution and the inventory policy is a kind of continuous review (r, q). in this paper, a model based on ...

The paired comparison (PC) method is used to investigate reliability, transitivity, and decision time for binary choices among goods and sums of money. The PC method reveals inconsistent choices and yields individual preference order over the set of items being compared. The data reported support the transitivity assumption and demonstrate high reliability for individual preference order. The p...