Related Experiment Video
Updated: Jun 16, 2026
09:42
Using the Dot Assay to Analyze Migration of Cell Sheets
Published on: December 5, 2017
"Going with the flow"--a comparison of interstate elderly migration during 1970-2000 using the (I)PUMS versus full
Karen Smith Conway1, Jonathan C Rork
1Department of Economics, University of New Hampshire, Durham, USA.
Summary
Elderly migration patterns remained stable from 1970-2000. Data source choice, particularly Integrated Public Use Microdata Series (IPUMS), can exaggerate changes in elderly migration over time.
Area of Science:
- Demography
- Sociology
- Geography
Background:
- State-to-state elderly migration patterns are a key demographic indicator.
- Understanding migration trends is crucial for policy and resource allocation.
- Previous studies have utilized various data sources, leading to potential inconsistencies.
Purpose of the Study:
- To analyze changes in elderly migration patterns between 1970 and 2000.
- To compare migration findings derived from census flow tabulations and IPUMS data.
- To assess the reliability of different data sources for studying elderly migration.
Main Methods:
- Calculation of descriptive statistics including migration rates and geographic concentration (Herfindahl-Hirschman Index).
- Comparative analysis using correlations and regression to assess temporal and data source differences.
- Examination of top origin and destination states for elderly migrants.
Main Results:
- Elderly migration rates increased until 1980, then stabilized with a slight decline.
- Geographic concentration of elderly migration decreased, with shifts in popular destination states.
- Migration patterns demonstrated high persistence over time, especially with larger census datasets.
Conclusions:
- Elderly interstate migration patterns have been largely stable since 1970.
- The Integrated Public Use Microdata Series (IPUMS) may overestimate temporal changes in elderly migration due to sample size.
- Census flow tabulations provide a more stable representation of long-term elderly migration trends.
Related Concept Videos
00:57Population Growth
Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
01:29Gradually Varying Flow
Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
01:24Rapidly Varying Flow
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
01:26Aging
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
00:53Migration
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
01:22Applications of Life Tables
Life tables are versatile across various fields, providing a quantitative basis for analyzing mortality and survival rates. Whether used by demographers, actuaries, epidemiologists, or sociologists, life tables offer valuable insights into the dynamics of life and death, facilitating informed decisions in public health, insurance, conservation, and beyond. Their broad applicability highlights the interconnectedness of demographic data with practical outcomes in everyday life and strategic...