摘要:

AbstractThe present work derives the distribution of the time required to remove a fixed number of elementsW

ISSN:8755-0024    

DOI:10.1002/asm.3150040302

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY

摘要:

AbstractMultiple comparison tests are not ordinarily employed in econometric analysis. An example of the application of a step‐down approach to a much studied problem is set forth. Comments on the estimated results and on the relevance of these tests to the present and other economic analyses are also presented. The application of the multiple comparison tests aids in the identification of a relatively simple regression equation of residential natural gas deman

ISSN:8755-0024    

DOI:10.1002/asm.3150040303

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY

摘要:

AbstractIn this paper we discuss the estimation of mean and standard errors of the eigenvalues and category quantifications in generalized non‐linear canonical correlation analysis (OVERALS). Starting points are the delta method equations, but the jack‐knife and bootstrap are used to provide finite difference approximations to the derivati

ISSN:8755-0024    

DOI:10.1002/asm.3150040304

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY

摘要:

AbstractWe consider a single‐item, continuous‐review, (s, S) inventory system, under complete backlogging and a constant procurement lead time. Demands occur in independent, identically distributed batches, separated by independent identically distributed intervals. The model also includes a class of periodic review systems as a special case. Of interest are the optimal control policies with respect to a stationary cost rate function, constructed to include ordering, holding and shortage costs. We study the structural properties of the cost rate function and report some new bounds and optimality conditions. An application of these to the computation and approximation of optimal policies is also discus

ISSN:8755-0024    

DOI:10.1002/asm.3150040305

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY

摘要:

AbstractWe present a new methodology for simultaneously assessing competitive market structure and deriving market segments. A hierarchical or ultrametric tree representation is estimated in a maximum likelihood framework from collected paired‐comparison choice data. The derived tree portraysbothbrands and consumers/households/segments as terminal nodes, where the ‘closer’ a brand is to a particular consumer/household/segment in the tree, the higher the predicted probability of that consumer/household/segment choosing that particular brand. This paper initially presents an introduction to the problem of market structure assessment. We review the extensive marketing literature on market structure and survey several competing methodologies. The proposed stochastic ultrametric tree unfolding methodology is technically described and several program options are indicated. An illustration of the proposed methodology is presented with respect to paired comparison choice data collected from a convenience sample involving the over‐the‐counter analgesics market. Finally, several areas for future research are i

ISSN:8755-0024    

DOI:10.1002/asm.3150040306

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY

摘要:

AbstractSeveral classes of problems can be modelled as queueing systems with failures where preventative maintenance has to be optimized: relevant examples are computer systems, databases and production lines.This paper studies a simple case of such a situation based on the M/M/1 queue where the state of the server can take two values (on, off); the transition on–off happens either when there is a failure or when one decides to maintain. The characterization and an approximation of an optimal policy are given. Extensions to more general models, including general Markov processes, are examine

ISSN:8755-0024    

DOI:10.1002/asm.3150040307

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY

ISSN:8755-0024    

DOI:10.1002/asm.3150040308

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY

ISSN:8755-0024    

DOI:10.1002/asm.3150040301

出版商:John Wiley&Sons, Ltd.    

年代:1988

数据来源: WILEY