Strategies for model‐revision in a high school genetics classroom

Recent proposals to improve science education (e.g., AAAS, 1989; Rutherford & Ahlgren, 1990) have stressed the importance of providing high school students with a broad knowledge base consisting of a body of core concepts and theories. Science educators (Duschl, 1990; AAAS, 1989; Peterson & Jungck, 1988) have also argued that while concepts are an important part of any education, no student's scientific education can be considered complete without a complementary knowledge of the nature of science, including an understanding of the tentative nature of scientific knowledge and how it is constructed. In this paper we describe a science classroom in which students are given opportunities to construct and use scientific knowledge to solve realistic genetics problems, and suggest that allowing students to engage in the production of scientific knowledge can support science learning.     

Influence analysis in multivariate linear general models

In this paper we obtain several influence measures for the multivariate linear general model through the approach proposed by Muñoz-Pichardo et al. (1995), which is based on the concept of conditional bias. An interesting charasteristic of this approach is that it does not require any distributional hypothesis. Appling the obtained results to the multivariate regression model, we obtain some measures proposed by other authors. Nevertheless, on the results obtained in this paper, we emphasize two aspects. First, they provide a theoretical foundation for measures proposed by other authors for the mul¬tivariate regression model. Second, they can be applied to any linear model that can be formulated as a particular case of the multivariate linear general model. In particular, we carry out an application to the multivariate analysis of covariance.     

A Note on the Moments and Computer Generation of the Shifted Gompertz Distribution

In this paper we give a class of row-column designs with the property that the i-th row and the j-th column have precisely r treatments in common. A conjecture that such designs are quasi-factorial is disproved by showing that the designs given in this paper are not quasi-factorial. It is also shown that the designs given here are nearly optimal.     

Risk Analysis: Celebrating the Accomplishments and Embracing Ongoing Challenges

As part of the celebration of the 40th anniversary of the Society for Risk Analysis and Risk Analysis: An International Journal, this essay reviews the 10 most important accomplishments of risk analysis from 1980 to 2010, outlines major accomplishments in three major categories from 2011 to 2019, discusses how editors circulate authors’ accomplishments, and proposes 10 major risk-related challenges for 2020–2030. Authors conclude that the next decade will severely test the field of risk analysis.     

Operational Research changes: tales from a parallel universe

Operational research and statistics share many common features. A review of the historical development and of some current dilemmas in operational research is given, in the belief that the narrative will fulfil a wider purpose by causing statisticians to reflect on related aspects of the evolution of their own subject in a rapidly changing environment.     

Occupational mobility and trust: Reconsidering mobility effects

This paper hypothesizes that a hierarchy of types of mobility and immobility may be used as an interaction term to determine whether there is evidence of mobility effects beyond those contributed by origin and destination. The dependent variable is a trust scale constructed from responses to three questions that have repeatedly appeared on the General Social Survey. The analysis of data from the GSS, 1972–1994, reveals that some categories of the mobility dummy variable are significant for the 1970s and 1980s, but not for the 1990s. Although the dummy variables for occupational mobility contribute to a model constructed to explain the respondents’ trust of others, father's occupation and respondent's current occupation generally do not. The discussion considers the limitations of a reliance on census occupational categories to study the effects of occupational mobility, and suggests the potential benefits of examining occupational mobility within industries.     

THE CONCEPT OF COMPETITION IN ROBERT PARK'S SOCIOLOGY*

This article examines Robert Park's concept of competition and the way in which it appears in his analysis of civilization and social change. Conventional interpretations of his writings have tended to emphasize that he radically separated presocial, ecological processes from interaction based on communication. Although Park does attempt such a separation, I argue that his thoughts on social change reflect an ambivalence about the relative degree of autonomy of social and cultural processes. Consequently, Park's evaluation of these processes reflects the judgment that contemporary forms of competition are instrumental for societal progress.