School dropouts in Ontario: A simulation of the phenomenon in a local school system

The article describes a simulation model and some rather lengthy statistical exercises analyzing the high school dropout phenomenon in Ontario and estimating the effect of policy measures which might affect the loss rates. The article is one of a series of dropout studies which have been carried out by the faculty and research staff of the Ontario Institute for Studies in Education since 1972. The earlier ones were surveys. The annual time series data which they established are now being used for simulations such as those reported here.     

Incorporating Behavioral Anomalies in Strategic Models

Behavioral decision researchers have documented a number of anomalies that seem to run counter to established theories of consumer behavior from microeconomics that are often at the core of analytical models in marketing. A natural question therefore is how equilibrium behavior and strategies would change if models were to incorporate these anomalies in a consistent way. In this paper we identify several important and generalizable anomalies that modelers may want to incorporate in their models. We briefly discuss each phenomenon, identify a key unresolved issue and outline a research agenda to be pursued.     

Formal integration archetypes in ambidextrous organizations

Research suggests that organizational ambidexterity, an organization's capacity to pursue both exploratory and exploitative activities, is critical to firm innovation and performance. Extant research primarily emphasizes several firm‐level informal integration mechanisms, such as creating a common vision and relying on social integration, for integrating structurally ambidextrous units. Research has largely ignored, however, the formal mechanisms by which organizations have integrated such units. In this inductive study, using archival and interview data from organizations in Silicon Valley, we address this gap by identifying the formal integration archetypes that enable core business units to collaborate with new venture units to incubate new businesses. The four integration archetypes that enable collaboration vary along two key dimensions: who initiates new ventures and when collaboration is solicited. We identify formal administrative and resource mechanisms that enable such collaboration. We combine the disparate literatures of temporal and spatial separation of ambidextrous structures, and demonstrate how these must be combined at the business unit and new venture levels of analysis to achieve integration. The practical contribution of this study lies in identifying suitable contexts in which each of these archetypes can be utilized by practitioners for reintegrating new venture projects developed in separate structures.     

Disclosure of GAAP line items in earnings announcements

We provide new evidence on the disclosure in earnings announcements of financial statement line items prepared under Generally Accepted Accounting Principles (GAAP). First, we investigate the circumstances that might provide disincentives generally for GAAP line item disclosures. We find that managers who regularly intervene in the earnings reporting process limit disclosures at the aggregate level and in each of the financial statements so as to more effectively guide investor attention to summary financial information. Specifically, this disclosure behavior obtains when managers habitually cater to market expectations, engage in income smoothing, or use discretionary accruals to improve earnings informativeness. Second, we predict and find that the specific GAAP line items that firms choose to disclose are determined by the differential informational demands of their economic environment, consistent with incentives to facilitate investor valuation. However, these valuation-related disclosure incentives are muted when managers habitually intervene in the earnings reporting process.     

Estimation of catastrophic quantities of toxic chemicals by atmospheric dispersion modeling

In response to the Bhopal disaster and several repeated chemical releases (even though of less dangerous magnitude) in New Jersey, the state of New Jersey passed a bill on January 8, 1986, which is aimed at the prevention of such catastrophic releases in the state. This bill is officially referred to as the Toxic Catastrophe Prevention Act (TCPA). The TCPA identified eleven specific Extraordinarily Hazardous Substances (EHS). Table 1 lists these eleven EHS identified in the Act and their reportable quantities. The TCPA aims at the prevention of the release of these EHS into the environment. The Legislature did not provide the basis and background of the development of the reportable quantities of these eleven EHS. The TCPA mandates that the New Jersey Department of Environmental Protection (NJDEP) shall expand the list of these EHS and shall “… correlate the substances with the quantities required to produce the potentially catastrophic circumstances.”     

A comparative cultural study of mathematics education at Northern Cyprus and Turkmenistan secondary schools

This study was aimed at investigating the opinions of secondary school supervisors about mathematics education as a cross cultural study at the secondary schools of Northern Cyprus and Turkmenistan. A semi-structured interview was used to elicit responses from three supervisors from inside of the Northern Cyprus and eight educational supervisors from province of Turkmenistan (totalling eleven participants from two countries) about mathematics education in both countries to make a cross cultural comparison. Findings of the study indicated major challenges such as short duration of the control period, ignorance about the facilities and conditions, coincidental selection of the topics and classes, teacher’s unawareness of the evaluation criteria, and incompetence of supervisors in the field of mathematical inspection. It was further found that the difference between both the countries on the matter of control of the mathematics education is not very big. The study has positive significance for Ministry and Department of Education, Education Supervisors, administrators, researchers and teachers on effectively implementing mathematics education.     

A generalized correlated binomial distribution with application in multiple testing problems

A typical microarray experiment often involves comparisons of hundreds or thousands of genes. Since a large number of genes are compared, simple use of a significance test without adjustment for multiple comparison artifacts could lead to a large chance of false positive findings. In this context, Tsai et al. (Biometrics 59:1071–1081, 2003) have presented a model that studies the overall error rate when testing multiple hypotheses. This model involves the distribution of the sum of non-independent Bernoulli trials and this distribution is approximated by using a beta-binomial structure. Instead of using a beta-binomial model, in this paper, we derive the exact distribution of the sum of non-independent and non-identically distributed Bernoulli random variables. The distribution obtained is used to compute the conditional false discovery rates and the results are compared to those obtained, in Table 3, by Tsai et al. (Biometrics 59:1071–1081, 2003).