摘要:

ABSTRACTIn either simple or multivariate regression models, measured coefficients represent a kind of average of co‐variant relationships implicit in the data. For time‐series data, if co‐variant relationships follow no particular pattern over the sample period, use of this average in forecasting is rational. However, if relationships among independent and dependent variables is undergoing change over time, then measured regression coefficients are likely to be poor tools for prediction. This paper is an exploratory study of this general problem area. It develops implications as to the predictive impact of the problem and offers preliminary suggestions as to a method of developing predictions under such circumst

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01460.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTA statistical test is presented to detect the presence of a Poisson input source into a queueing system. The fact that the arrival times of a Poisson input source are distributed independently and uniformly over time is used in conjunction with the central limit theorem to develop a test, based on the sum of the arrival times over a given interval of time, for the hypothesis that an input source into a queueing system is Poisson. Failure to reject this hypothesis gives one an extra degree of assurance that traditional queueing models assuming a Poisson input are applicable.

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01461.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTA method is presented for the scheduling of a company's investments of its predictable, short‐term, excess cash. The problem is structured in a way that leads to a fairly simple dynamic programming algorithm. The method is very flexible with regard to the type of investments considered; no structural properties of rates of return or availability are made except that they are predictable. The method allows the choice of holding to maturity or not and the choice can differ for different types of investments. A bank constraint, which fixes the average bank balance over the planning period, is added and the method of solution obtaine

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01462.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTThis study was designed to suggest and evaluate empirically a series of variables to explain the behavior of two important rail transport system performance parameters: speed and reliability of transit time. Variables related to the carriers, the economic situation, the location and the nature of the shipper/carrier interaction were tested using a combination of factor analysis and regression analysis. The results support the premise that while distance is very important in explaining rail service, other variables also contribute substantially to understanding transit time by this transport mode.

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01463.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTA pollution damage function is developed, using data from a study on the sensitivity of morbidity to ambient air concentrations of individual pollutants. This function is used in a model which incorporates the costs and technology for pollution abatement in the St. Louis Airshed. A set of air quality standards is determined which minimizes morbidity subject to a given control budget constraint. The results indicate that there should be a greater reduction of the pollutants associated with stationary sources than of those characteristic of the automobile.

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01464.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTIn this paper we show that a striking improvement in the explanatory power of a “dividend type” of security valuation model can be obtained by classifying companies into equivalent risk categories, estimating the discount factor for a category, and then constructing a cross‐sectional model for it. The increased homogenity of the data base improves the model's sensitivity to systematic forces, but does not sacrifice the heterogeneity of the independent variables.Assuming that the difference between the intrinsic value of a security and its market value should be zero, the authors demonstrate a method for estimatingkjt, the market discount rate for thejthrisk category in thetthperiod. The results of the estimation procedure appear to be reasonable and when used in our security valuation model they produce higher coefficients of determination (R2) than those previously published for similar m

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01465.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTThe problem of selection of the best item from one of a list of items to meet an objective is treated. The items are usually compared against factors or states of nature. The following techniques used to arrive at the “best” selection are treated:1. Ranking and rating2. Paired comparison and successive comparison3. Average score4. Dominance5. Game theoryLaplace criterionMethod of majority ruleBayes solutionCriterion of pessimismCriterion of optimismCriterion of regretMinimax and maximin in gaming situationsMixed strate

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01466.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTFor simple inventory models with linear costs and stochastic demands, the technique of incremental analysis is applied to the problem of determining both the optimum number of units to stock and the associated expected profit. The cases where there are shortage costs and where reordering is possible are covered. Sensitivity analysis of optimum solutions is shown to be useful and straightforward. Problems involving cost minimization, rather than profit maximization, are discussed. The emphasis is on discrete probability distributions of demand, but the extensions to continuous probability distributions are clearly indicated.

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01467.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

ABSTRACTThe status of Quantitative Methods in business education is perhaps less “standard” and less understood than any other field. This is probably even more true at the graduate than at the undergraduate level. Courses which are normally considered to be Quantitative Methods courses are often housed in a wide range of departments. Some courses which would normally be classified as Quantitative Methods courses are also housed in colleges other than Business Administration.In order to determine the current status of graduate quantitative methods curricula in schools of business, a survey was made of the member institutions of the American Association of Collegiate Schools of Business. This paper presents the survey findi

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01468.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1971.tb01469.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY