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Adjustment Models (adjustment + models)

Distribution by Scientific Domains
Humanities and Social Sciences75%

Selected Abstracts

Urban, Suburban, and Exurban Sprawl in the Rocky Mountain West: Evidence from Regional Adjustment Models,

JOURNAL OF REGIONAL SCIENCE, Issue 1 2005
John I. Carruthers
Three interrelated questions motivate the research. How does the proliferation of urban, suburban, and exurban sprawl in the Rocky Mountain West relate to the population and employment growth process? Are population and employment endogenously determined there? And what does this imply for the sustainability of economic development in the region? Through a series of regional adjustment models, the empirical analysis links population and employment growth in the Rocky Mountain West to explicit spatial outcomes and delivers substantive evidence of endogeneity between the two. The results suggest that the long-term prosperity of the region depends on the preservation of the high quality of life it offers, and that greater intergovernmental coordination, careful infrastructure planning, and attention to the character of its economic structure may help to accomplish this. Future research should focus on looking deeper into certain explanatory variables used in this analysis and on developing a better picture of what the spatial equilibrium that regional adjustment models emulate may look like. [source]

Spatial patterns of disparity and diversity of the Recent cuttlefishes (Cephalopoda) across the Old World

JOURNAL OF BIOGEOGRAPHY, Issue 8 2003
Pascal Neige
Abstract Aim Diversity and disparity metrics of all Recent cuttlefishes are studied at the macroevolutionary scale (1) to establish the geographical biodiversity patterns of these cephalopods at the species level and (2) to explore the relationships between these two metrics. Location Sampling uses what is known about these tropical, subtropical and warm temperate cephalopods of the Old World based on a literature review and on measurements of museum specimens. Some 111 species spread across seventeen biogeographical areas serve as basic units for exploring diversity and disparity metrics in space. Methods Landmarks describe the shape of the cuttlebone (the inner shell of the sepiids) and differences between shapes are quantified using relative warp analyses. Relative warps are thus used as the morphological axis for constructing morphospaces whose characteristics are described by disparity indices: total variance, range, and minimum and maximum of relative warps. These are analysed and then compared with the diversity (species richness) metric. Results Results show no significant latitudinal or longitudinal gradients either for diversity or for disparity. Around the coast of southern Africa, disparity is high regardless of whether diversity (species richness) is high or low. In the ,East Indies' area disparity is low despite the high diversity. Main conclusions The relationship between diversity and disparity is clearly not linear and no simple adjustment models seem to fit. The number of species in a given area does not predict its disparity level. The particular pattern of southern Africa may be the result of paleogeographical changes since the Eocene, whereas that of the ,East Indies' may indicate that this area could act as a centre of origin. However, the lack of any clear phylogenetical hypothesis precludes the study from providing any explanation of the observed patterns. [source]

Urban, Suburban, and Exurban Sprawl in the Rocky Mountain West: Evidence from Regional Adjustment Models,

JOURNAL OF REGIONAL SCIENCE, Issue 1 2005
John I. Carruthers
Three interrelated questions motivate the research. How does the proliferation of urban, suburban, and exurban sprawl in the Rocky Mountain West relate to the population and employment growth process? Are population and employment endogenously determined there? And what does this imply for the sustainability of economic development in the region? Through a series of regional adjustment models, the empirical analysis links population and employment growth in the Rocky Mountain West to explicit spatial outcomes and delivers substantive evidence of endogeneity between the two. The results suggest that the long-term prosperity of the region depends on the preservation of the high quality of life it offers, and that greater intergovernmental coordination, careful infrastructure planning, and attention to the character of its economic structure may help to accomplish this. Future research should focus on looking deeper into certain explanatory variables used in this analysis and on developing a better picture of what the spatial equilibrium that regional adjustment models emulate may look like. [source]

American Society of Transplant Surgeons Transplant Center Outcomes Requirements,A Threat to Innovation

AMERICAN JOURNAL OF TRANSPLANTATION, Issue 6 2009
M. M. Abecassis
The transplant center regulations recently published by the Centers for Medicare and Medicaid (CMS) mandate that observed program-specific survival outcomes to fall within expected risk-adjusted outcomes. Meeting these outcomes is essential to continued participation in the Medicare program. Both donor and recipient variables not considered in current risk adjustment models can result in inferior outcomes and therefore may cause an overestimation of transplant center expected performance, precluding participation in the federally funded Medicare program. We reviewed the most recent four reporting periods published by the Scientific Registry for Transplant Recipients on their public website. We identified kidney, liver and heart transplant programs that were flagged for having outcomes statistically lower than expected as well as those that failed to meet CMS criteria. We also analyzed whether center volumes correlated with outcomes in these centers. We highlight the need for mitigating factors that could justify inferior outcomes under specific circumstances. Failure to reach consensus on such a mechanism for appeal may result in risk-averse behavior by transplant centers with respect to innovation and therefore hamper the ability to advance the field of transplantation. We propose a methodology that may address this emerging dilemma. [source]