1,721,071 research outputs found
The Estimation of Place-to-Place Migration Flows Using an Alternative Log-Linear Parameter Coding Scheme
No full textThe log-linear model, with an alternative parameter coding scheme, is used in this paper to obtain estimates of place-to-place migration flows in situations where the data are inadequate or missing. The alternative parameter coding scheme is particularly useful in constructing the origin-destination interaction structure. To illustrate the method, two empirical examples are presented. The first demonstrates the effectiveness of the methodology by estimating known migration flows between states in the Western region of the United States during the 1985-1990 period. The second example focuses on estimating international migration flows in the Northern region of Europe during the 1999-2000 period where the data are incomplete. Both examples demonstrate the usefulness and generality of this particular method for estimating migration flows
The estimation of international migration flows: A general technique focused on the origin-destination association structure
No full textThe log-linear model, with an alternative parameter coding scheme, is used in this paper to obtain estimates of international migration flows in situations where the data are inadequate or missing. The alternative parameter coding scheme is particularly useful in constructing the origin – destination association stricture—a key element often required for more-accurate predictions. To illustrate the method, international migration flows between countries in the northern region of Europe during the 1999 – 2000 period are estimate
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
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/
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 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
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
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