Results 271 to 280 of about 265,291 (311)

Geographic Variation in Health Care

Annual Review of Medicine, 2012
Measurements of health care spending and outcomes in a geographic area and comparisons of one area to another have been used to make observations about health delivery systems and guide health care policy. Medicare claims files are a ready source of data about health care utilization and have served as the basis for a large number of studies in the ...
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Geographic Variation Allospecies

2001
Abstract Closely related allopatric populations are often so distinct that little doubt exists that they have passed from the subspecies to the species level. Such species are called “allospecies,” and a set of allospecies is called a “superspecies.” A superspecies is defined as a monophyletic group of closely related and largely or ...
Ernst Mayr, Jared Diamond
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Absence of Geographic Variation

2001
Abstract One might expect that each species would be represented by a separate subspecies or allospecies on each island where the species occurs, if all of the following four conditions were met: 1) if the population of each island had been established by a single founding event; 2) if that event had occurred in the distant past, so that
Ernst Mayr, Jared Diamond
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Geographic Variation Megasubspecies

2001
Abstract Like almost any classificatory system that classifies anything, the Linnaean system of taxonomic classification makes arbitrary divisions between items, some of which, in fact, grade continuously into each other. Dividing the continuous processes of speciation and geographic variation into hierarchical taxonomic levels is an ...
Ernst Mayr, Jared Diamond
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Geographic Variation: Subspecies

2001
Abstract Let us consider the frequency of geographic variation among Northern Melanesian species, at first without inquiring into the actual number of distinct populations per variable species. We can evaluate this frequency in two ways.
Ernst Mayr, Jared Diamond
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Geographical Variations

Acta Archaeologica, 2011
Lisbeth Prøsch-Danielsen, Eli-Christine Soltvedt   +1 more
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Geographic Variation

Annual Review of Ecology and Systematics, 1972
Stephen Jay Gould, Richard F. Johnston
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Geographic Variations in Controlled Trials

New England Journal of Medicine, 2017
Matthieu, Roustit, Charles, Khouri, Rémy, Boussageon   +2 more
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Geographical and Generational Variations

2014
The Japanese have different lifestyles depending on their place of residence and their age or generation. Their eating habits, type of housing, language, style of thinking, and many other aspects of their everyday life hinge upon where they live and how old they are.
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Geographic Variation in Behavior

1999
Studies of animal behavior often assume that all members of a species exhibit the same behavior. Geographic Variation in Behavior shows that, on the contrary, there is substantional variation within species across a wide range of taxa. Including work from pioneers in the field, this volume provides a balanced overview of research on behavioral ...
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