Exact moments of the symmetric cubic assignment statistic

Hubert (1987Assignment Methods in Combinatorial Data Analysis) presented a class of permutation, or random assignment, techniques for assessing correspondence between general k-dimensional proximity measures on a set of “objects.” A major problem in higher-order assignment models is the prohibitive level of computation that is required. We present the first three exact moments of a test statistic for the symmetric cubic assignment model. Efficient computational formulas for the first three moments have been derived, thereby permitting approximation of the permutation distribution using well-known methods.     

The importance of social circumstances for Swedish women's subjective wellbeing

The importance of social circumstances for middle-age women's general subjective wellbeing (SWB) was investigated in a representative sample of Swedish women, aged 43 (N = 369). The results showed non-existent to moderate relationships between a number of social circumstances variables and general SWB. The strongest relationship was found between marital status and global life satisfaction. Being off work because of illness and household income were the strongest predictors of negative affect. A moderate relationship was found between a cumulated social disadvantage index and SWB, indicating that extreme differences in this index were related to fairly large differences in SWB. In person-oriented analyses, social circumstances were compared between women with a typical profile of generalised low SWB and women with a typical profile of generalised above-average SWB. The results indicated stronger relationships between SWB and the cumulative disadvantage index and unemployment than was the case in the variable-oriented analyses. When personality factors were controlled for, they eliminated nearly all relationships between the social circumstances variables and SWB, except for those between global life satisfaction and marital status or unemployment.     

Organization theory: Where are you?

This paper seeks to summarize the present state of organization theory. It takes as its starting-point the work of early organization theorists and demonstrates that their work has been challenged in basically four different ways, i.e. regarding the view on (a) individuals in organizations, (b) the interaction among individuals in organizations, (c) the relationship between organizations and their environments and (d) the technology of organizations. The implications of these qualifications are discussed with reference to recent literature. These discussions led to the conclusion that the number of research questions have increased rather than decreased over the years. Thus, a unified organization theory may be less valid today than at the beginning of the century. This circumstance, however, it is argued, should not be considered a regression but rather a sign of increasing insight.     

A decision support methodology for strategic planning in maritime transportation

This paper presents a decision support methodology for strategic planning in tramp and industrial shipping. The proposed methodology combines simulation and optimization, where a Monte Carlo simulation framework is built around an optimization-based decision support system for short-term routing and scheduling. The simulation proceeds by considering a series of short-term routing and scheduling problems using a rolling horizon principle where information is revealed as time goes by. The approach is flexible in the sense that it can easily be configured to provide decision support for a wide range of strategic planning problems, such as fleet size and mix problems, analysis of long-term contracts and contract terms. The methodology is tested on a real case for a major Norwegian shipping company. The methodology provided valuable decision support on important strategic planning problems for the shipping company.     

The Planning Stage in Statistical Reasoning

An important step in the statistical problem-solving process is the selection of the appropriate statistical procedure for the real-world situation under analysis. A decision-tree term project has been found to be an effective teaching device to help MBA students understand this step. The project requires the students to construct a decision-tree structure, which, through a series of questions and responses, will lead from the statement of a statistical question to the appropriate sampling distribution to use in addressing the question.     

BEYOND EDUCATION AND FAIRNESS: A LABOR MARKET TAXATION MODEL FOR THE GREAT GATSBY CURVE

Applied researchers have been drawn to models that attribute the demonstrated cross‐country differences in intergenerational income transmission to government failures to invest in the human capital of poor children. To highlight another potential mechanism, the disincentive effects of labor market taxation and redistribution, we present a simple model that can explain cross‐country differences in intergenerational mobility and other previously observed empirical patterns. Empirical tests using data on income mobility, tax rates, and public expenditures largely support the model predictions. We conclude that the common presumption that intergenerational mobility largely measures fairness or opportunity, and the resultant policy recommendations, are premature. (JEL D31, J24, J62)     

Political and economic determinants of expenditure on day services for persons with intellectual disabilities or autism

This study investigates whether the Swedish national entitlement legislation, which is known to be one of the most developed in Europe for persons with intellectual disabilities or autism, accomplishes its aim to provide equal quality of day services independent of location. We estimated a reduced-form model of demand and supply-side determinants of a latent quality variable for day-service programmes using panel data on expenditure per attendee for the 290 Swedish municipalities 2004–2012. We found that expenditure per attendee is among others affected by changes of the local tax base and outcome in elections to the local assemblies. These results imply that rights of persons with intellectual disabilities with regard to equal quality of day services independent of where they live are not fully honoured in budget allocation decisions made by local governments.     

Search for optimal designs in a three stagenested random model

In this paper we define a class of unbalanced designs, denoted by C_k,s,t, for estimating the components of variance in a k-stage nested random effects linear model. This class contains many of the designs proposed in the literature for nested components of variance models. We focus on the three-state model and discuss the determination of locally optimal designs within this class using a systematic computer search. For large sample sizes we show that approximate optimal designs may be obtained using a limit argument combined with numerical optimization. A comparison of our designs with previously published designs suggests that, in many cases, our designs result in substantial gains in efficiency.     

THE ORGANIZATION OF THE INNOVATION INDUSTRY: ENTREPRENEURS,VENTURE CAPITALISTS,AND OLIGOPOLISTS

We construct a model where incumbents can either acquire basic innovations from entrepreneurs, or wait and acquire developed innovations from entrepreneurial firms supported by venture capitalists. We show that venture‐backed entrepreneurial firms have an incentive to overinvest in development vis à vis incumbents due to strategic product market effects on the sales price of a developed innovation. This will trigger preemptive acquisitions by incumbents, thus increasing the reward for entrepreneurial innovations. We also show that venture capital can emerge in equilibrium if venture capitalists have cost advantages, or if development is associated with double moral hazard problems. (JEL: G24, L1, L2, M13, O3)