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Results for “Demographic Effectiveness”

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At least 37 records · Page 2Linked to original sources
PubMed1997

Nonparametric bootstrap analysis with applications to demographic effects in demand functions.

"A new bootstrap proposal, labeled smooth conditional moment (SCM) bootstrap, is introduced for independent but not necessarily identically distributed data, where the classical bootstrap procedure fails.... A good example of the benefits of using nonparametric and bootstrap methods is the area of empirical demand analysis. In particular, we will be concerned with their application to the study of two important topics: what are the most relevant effects of household demographic variables on demand behavior, and to what extent present parametric specifications capture these effects."

Behavior↗
PubMed1994

The wax and wane of interstate migration patterns in the U.S.A. in the 1980s: a demographic effectiveness field perspective.

The author analyzes the structure of temporal changes in U.S. internal migration over the period 1980-1988 using data from matched income tax returns. "A number of hypotheses are explored about how in-migration and out-migration fields wax and wane, thereby giving rise to the overall shifts in demographic effectiveness measured over the period. The results highlight the characteristics of recent (1980-88) shifts in U.S. internal migration patterns including net migration reversals from strong net in-migration to strong net out-migration for states with significant energy sectors, the stanching of net out-migration from many states of the American manufacturing belt, the turnaround to net in-migration for all of northern New England, and the continuance of highly effective net in-migration to the sunbelt states of Florida, Arizona, and Nevada."

Americas↗
PubMed1987

The demographic effects of immigration.

"This paper seeks to contribute to an understanding of the demographic consequences of immigration. The impact of immigration on population growth, population composition--by birthplace, age, sex, and marital status, and population distribution are briefly analysed. It is shown that the composition as well as the size of the intake is important. Five series of projections are presented to demonstrate the sensitivites of demographic trends to immigration policy changes." The data are for Australia for the period from the 1940s through the mid-1980s.

Age Factors↗
PubMedDate not supplied

Changing disease patterns, shifting demographics: effects on laboratory services.

Laboratory services of the early 21st century will be heavily influenced by significant demographic redistributions and shifts in the incidence and prevalence of disease. A persistent influx of immigrants literally will change the face of the U.S. population. Persons born between 1946 and 1964 will reach middle and old age and will require testing for arthritis, diabetes, cardiac dysfunction, Alzheimer's disease, and stroke. Efforts to combat infertility will expand. Tuberculosis, wrongly assumed to be under control, will continue to proliferate. Testing will be needed for the millions of people living with AIDS and for the millions more infected or suspected to be infected with HIV. Cancer screening and information from genetic markers will widen. Public screenings will be routinely offered in assorted sites. As the national focus shifts from curing illness to promoting health, laboratory tests will assess healthy persons to a greater degree than ever.

Acquired Immunodeficiency Syndrome↗
PubMed2006

Modeling the demographic effects of endocrine disruptors.

In this article we describe a series of strategic models of populations and individuals subject to challenge by endocrine disruptors. These models are not designed to be fitted to detailed data on specific species but rather are intended to provide general insights on the relative importance of different demographic mechanisms in the population context. Therefore, the models contain the minimum necessary biological detail, but in recompense they are highly accessible to mathematical analysis. We show that, over a range of models with contrasting biological detail, population viability is controlled by the number of female offspring that result from the average female's lifetime reproductive activity. Thus, male fertility changes have little effect at the population level until they become severe enough to reduce this average female output. We argue that in many circumstances endocrine disruptors are likely to produce directly deleterious effects on female fecundity at levels far below those required to reduce male fertility to dangerously low levels. Finally, we formulate a simple model of individual energetics that we argue can form the basis of a strategic discussion of the likely sensitivity of female demographic parameters to chemically induced changes in physiological function.

Animals↗
PubMed2002

Determining demographic effects of cypermethrin in the marine copepod Acartia tonsa: stage-specific short tests versus life-table tests.

Short-term lethal and sublethal responses of the calanoid copepod Acartia tonsa to cypermethrin were compared with life-table responses to assess whether or not it is necessary to use exposure periods longer than 5 days to estimate demographic responses to stress. More specifically, by limiting exposure periods to sensitive age classes (eggs, nauplii, copepodids, and adults) and including measurements on survival, egg production, and feeding rates, it was possible to derive a short test design of similar sensitivity and ecological relevance as full life-table tests. Short-term exposures to cypermethrin reduced copepodid's feeding rates at concentrations well below those affecting egg production rates and survival of eggs and adult stages. Lethal effects on naupliar stages occurred at lower concentrations than any other effect observed on eggs and adults. Life-table sensitivities of the intrinsic rate of increase ( r(m)) to cypermethrin were similar to those observed in short-term exposures. More specifically, exposure to cypermethrin impaired r(m) responses at concentrations (7.4 ng x L(-1)) that also affected feeding and naupliar responses. Our results show that by quantifying and separating combined toxic effects on ecologically relevant individual life-history traits, it is possible to develop toxicity test designs of similar ecological relevance yet that are less labor-intensive and costly than existing demographic tests.

Animals↗
PubMed1986

Socioeconomic and demographic effects of malaria eradication: a comparison of Sri Lanka and Sardinia.

The relationship between disease control, population growth and economic development is examined through a comparison of changes subsequent to malaria eradication campaigns in Sri Lanka and Sardinia. Both islands were similar in terms of malaria morbidity and mortality rates as well as a history of massive malaria eradication campaigns using DDT immediately after the Second World War. The critical comparative distinction is that Sardinia had a much lower population density than Sri Lanka. In both cases, the anticipated effects of malaria control were increased agriculture production in endemic zones coupled with a relief of population pressure in non-malaria areas. This has not happened. Patterns of demographic change, marked by sharp declines in general mortality and accelerated population rates, are similar in both cases. Malaria control has resulted in economic development in neither case, however, and this is explained using ecological and political-economic analyses.

Ecology↗
PubMed1988

Comparative demographic effects of Canadian-U.S. immigration flows.

"A joint study by Statistics Canada and the U.S. Bureau of the Census examines special tabulations of U.S. residents born in Canada from the 1980 census of the United States and compares them with matching tabulations of Canadian residents born in the United States from the 1981 census of Canada. As might be expected, the two populations are remarkably similar and the preponderance of the migration flow is from Canada to the United States. The comparative social and economic characteristics of the two migrant stocks show the effects of increasing legal restrictions on migration between the two countries in the last two decades. The characteristics of the migrant flows have changed from large, unregulated population movements responding to economic motivations similar to internal migration flows to a much smaller, highly controlled movement more typical of long-distance international migration flows." This is a revised version of a paper originally presented at the 1987 Annual Meeting of the Population Association of America.

Americas↗
PubMed1990

Long term demographic effect of a constant stream of immigration when the population is not reproducing itself.

The author describes the use of a model to investigate "the age composition of the stationary population resulting from a condition of below replacement fertility and a continuous stream of immigrants, the size of which for any age remain invariant over time.... We have shown that the number dying among [migrants] is the same as the number of them entering over any time interval, and that is precisely how their stationarity is maintained." The geographical focus is on developed countries that are experiencing below-replacement fertility levels. (SUMMARY IN FRE AND SPA)

Age Distribution↗