1,721,003 research outputs found
Rogers Andrei — Matrix Analysis of International Population Growth and Distribution
No full textHecht Jacqueline. Rogers Andrei — Matrix Analysis of International Population Growth and Distribution. In: Population, 24ᵉ année, n°6, 1969. p. 1233
The spatial focus of US interstate migration flows
No full textDespite the widespread interest in the changing geographies of national migration regimes, it is somewhat remarkable that no widely accepted measure of the spatial concentration or focus exhibited by such geographies has emerged. We examine four of the most popular indices of inequality in this paper and contrast their performance as measures of spatial focus. Adopting the coefficient of variation as our preferred alternative, we go on to examine the spatial focus of aggregate interstate migration streams in the US over time. Then we consider disaggregations of the migration streams by age, race and nativity, and examine the role of states as national redistributors of these same subpopulations. We find that the migration patterns of the elderly, blacks, and the foreign-borns in general have exhibited levels of spatial focus that exceed those of their young adult, white, and native-born counterparts. With respect to the principal redistributor states, our findings for all subpopulations point to a very few states that persistently reappear in the group-specific classifications. In particular, California is a unique redistributor of the US population, always appearing as an extensive outward or inward redistributor of migrants
The American Community Survey's Interstate Migration Data: Strategies for Smoothing Irregular Age Patterns
No full textAge- and origin-destination-specific flows obtained from population samples often contain irregularities. The reason for this has mostly to do with the fact that migrations are relatively rare events. Biases in the analysis of migration flows can arise if these irregularities are not corrected for. Furthermore, accurate migration data are needed to understand population change and migration behavior. In this paper, we illustrate some typical examples of age-specific migration flows with irregular patterns, using the 2000-2005 American Community Survey (ACS) data. We then demonstrate how model migration schedules, log-linear models or a combination of both can be used to smooth the irregularities
Origin dependence, secondary migration, and the indirect estimation of migration flows from population stocks
No full textUS census data from 1940 to 2000 are used in this paper to illustrate the importance of origin dependence on migration streams and to examine the effects of such dependence on patterns of interregional migration. These findings are then used to make possible the indirect estimation of migration flows. A method is introduced that uses historical regularities found in the ratios of secondary to primary migration and two consecutive birthplace-specific counts of multiregional population stocks. The results demonstrate how patterns of primary and secondary migration act to shape population redistribution processes
Using Age and Spatial Flow Structures in the Indirect Estimation of Migration Streams
No full textThis paper presents a modeling strategy for describing and estimating interregional migration flows. The categorical log-linear model is used to demonstrate various approaches to estimation, including direct and indirect methods. And estimates of known data on interdivisional migration patterns in the United States during the 1995-2000 period are used to illustrate the effectiveness of the various log-linear models. The important aspects of the modeling strategy presented in this paper include parameter interpretation, incorporation of auxiliary or a priori information, and assessment of the various model predictions. The results show that capturing the interactions between origins and destinations are very important for accurate predictions
The regional demographics of the elderly foreign-born and native-born populations in the United States since 1950
No full textThis article is an examination of the influence of birthplace on the internal migration and spatial redistribution patterns of elderly foreign-born and native-born populations in the United States during 1950 to 1990. Using data drawn largely from the U.S. Census Bureau’s published and unpublished records and from various Public Use Micro-data Sample (PUMS) files of the Censuses of Population, the authors consider the following questions: (1) What have been the regional age compositions and geographies of U.S. elderly foreign-born and native-born populations over the past several decades? (2) What have been the demographic sources of growth that shaped those age compositions and geographies? (3) What have been the interregional migration patterns of elderly foreign-born populations, and how have they differed from those of elderly native-born populations? (4) Are recent interregional migration patterns of foreign-born and native-born elderly persons likely to generate increased or decreased regional concentrations of their respective populations
Fitting observed demographic rates with the multiexponential model schedule: An assessment of two estimation programs
No full textThe process of finding the best fitting model can often be very time consuming and tedious. Most computer programs are very specialized, and many require initial parameter estimates to fit a particular curve. Those that are most useful are ones that are versatile in applications, and ones that allow inputs of “rough” parameter estimates for finding the optimal ones. This paper focuses on current approaches for fitting observed age-specific demographic data with the multiexponential model schedule and uses two curve-fitting computer programs: MODEL and TableCurve2D. These two programs are assessed according to how well, and how simply, they can be used to fit age-specific fertility, mortality, and migration rates.<br/
Estimating the regional migration patterns of the foreign-born population in the United States: 1950-1990
No full textIn this paper, we apply model schedules to graduate data on the internal and external regional [U.S.] migration patterns of the foreign-born population for the 1950-1990 period.... To find estimates of the unrecorded migration flows in-between for four census-defined periods in our study (that is, for 1950-1955, 1960-1965, 1970-1975, and 1980-1985) we interpolate between the data of adjacent census time periods. Finally, we combine the estimated migration data with the corresponding mortality data to calculate and analyze the multiregional life tables and projections associated with each five-year time interval.
Immigration and the regional demographics of the elderly population in the United States
No full textObjectives This research examined the impacts of past international and interregional migration flows on regional elderly population growth and distribution patterns. Methods The authors used 1960, 1970, 1980, and 1990 Census data and multiregional demographic models to analyze changes in the sources of regional elderly population growth rates, age compositions, and spatial distributions over time. Results. Past elderly interregional migration patterns have exhibited considerable stability and have contributed less than aging-in-place in shaping regional elderly population geographies. Also the effects of immigration on elderly dependency ratios have been very modest. Discussion. Little evidence exists of any significant breaks with past trends in internal elderly migration patterns. Reconstruction of elderly population changes between 1950 and 1990 reveals that the driving force behind the changes was net aging-in-place and not net migration. Finally, analysis of the possible population rejuvenating effects of immigration suggests that although its impact has contributed to lower elderly-to-worker dependency ratios, its level over the past decades has been insufficient to counteract the much stronger countervailing impact of population aging
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