University of Arizona

About: University of Arizona is a education organization based out in Tucson, Arizona, United States. It is known for research contribution in the topics: Population & Galaxy. The organization has 63805 authors who have published 155998 publications receiving 6854915 citations. The organization is also known as: UA & U of A.

A general model for ontogenetic growth

Abstract: Several equations have been proposed to describe ontogenetic growth trajectories for organisms justified primarily on the goodness of fit rather than on any biological mechanism. Here, we derive a general quantitative model based on fundamental principles for the allocation of metabolic energy between maintenance of existing tissue and the production of new biomass. We thus predict the parameters governing growth curves from basic cellular properties and derive a single parameterless universal curve that describes the growth of many diverse species. The model provides the basis for deriving allometric relationships for growth rates and the timing of life history events.

Single-Case Intervention Research Design Standards

Abstract: In an effort to responsibly incorporate evidence based on single-case designs (SCDs) into the What Works Clearinghouse (WWC) evidence base, the WWC assembled a panel of individuals with expertise in quantitative methods and SCD methodology to draft SCD standards. In this article, the panel provides an overview of the SCD standards recommended by the panel (henceforth referred to as the Standards) and adopted in Version 1.0 of the WWC’s official pilot standards. The Standards are sequentially applied to research studies that incorporate SCDs. The design standards focus on the methodological soundness of SCDs, whereby reviewers assign the categories of Meets Standards, Meets Standards With Reservations, and Does Not Meet Standards to each study. Evidence criteria focus on the credibility of the reported evidence, whereby the outcome measures that meet the design standards (with or without reservations) are examined by reviewers trained in visual analysis and categorized as demonstrating Strong Evidence, Mod...

Governing the Hollow State

Abstract: For the past ten years the authors have conducted a concentrated research program on the dimensions and impact of the hollow state. The hollow state is a metaphor for the increasing use of third parties, often nonprofits, to deliver social services and generally act in the name of the state. The types of structures, incentives, and mechanisms used to control third-party providers have been the focus of this research. The empirical thrust of this research is on how effective various types of mechanisms, structures, and incentives are at promoting the effectiveness of contracted services. The normative question this research has raised, but not answered, is, What effect does government contracting with third-party providers have on the perceived legitimacy of the state? This article is a summary of the theoretical development and the empirical findings from the authors' research on the dimensions and impact of the hollow state in the domain of health and human services contracting. Elements of this article have appeared previously in this journal and in many others as well. The article's purpose is to integrate the authors' research on the hollow state. This is a summative article that seeks to bring together in one place what the authors have learned. In addition, new directions are explored for future research on the hollow state.