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Related Concept Videos

Migration00:53

Migration

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.
Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

Mechanistic Models: Compartment Models in Individual and Population Analysis

Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least squares (OLS)...
Parametric Survival Analysis: Weibull and Exponential Methods01:14

Parametric Survival Analysis: Weibull and Exponential Methods

Parametric survival analysis models survival data by assuming a specific probability distribution for the time until an event occurs. The Weibull and exponential distributions are two of the most commonly used methods in this context, due to their versatility and relatively straightforward application.
Weibull Distribution
The Weibull distribution is a flexible model used in parametric survival analysis. It can handle both increasing and decreasing hazard rates, depending on its shape parameter...
Population Growth00:57

Population 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.
Assumptions of Survival Analysis01:15

Assumptions of Survival Analysis

Survival models analyze the time until one or more events occur, such as death in biological organisms or failure in mechanical systems. These models are widely used across fields like medicine, biology, engineering, and public health to study time-to-event phenomena. To ensure accurate results, survival analysis relies on key assumptions and careful study design.
Speciation Rates01:07

Speciation Rates

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Related Experiment Video

Updated: May 9, 2026

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Published on: July 4, 2007

Migration and Pacific mortality: estimating migration effects on Pacific mortality rates using Bayesian models.

Ken Richardson1, Santosh Jatrana, Martin Tobias

  • 1Department of Public Health, Wellington School of Medicine and Health Sciences, University of Otago, PO Box 7343, Wellington, New Zealand, ken.richardson@otago.ac.nz.

Demography
|August 2, 2013
PubMed
Summary

Pacific people in New Zealand experience higher mortality. Recent migrants (under 25 years) show lower mortality rates than long-term residents, suggesting health declines over time.

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Last Updated: May 9, 2026

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Published on: July 4, 2007

Area of Science:

  • Public Health
  • Epidemiology
  • Sociology of Health

Background:

  • Pacific populations in New Zealand exhibit elevated mortality rates compared to European/Other ethnic groups.
  • Understanding factors influencing these disparities, such as nativity and duration of residence, is crucial for targeted health interventions.

Purpose of the Study:

  • To investigate variations in mortality rates among Pacific people in New Zealand based on their place of birth (natality) and length of residency.
  • To identify potential differences in all-cause, cancer, and cardiovascular disease (CVD) mortality linked to duration of stay in New Zealand.

Main Methods:

  • Utilized linked census and mortality data from the 2001 New Zealand census for individuals aged 25-74, followed for up to three years.
  • Employed Hierarchical Bayesian modeling to manage sparse data and calculated directly age-standardized posterior mortality rates.

Main Results:

  • Found minimal differences in all-cause, cancer, and cardiovascular disease (CVD) mortality between overseas-born and New Zealand-born Pacific individuals.
  • Observed significantly lower all-cause, and potentially cancer and CVD, mortality rates for Pacific migrants residing in New Zealand for less than 25 years compared to those residing longer.

Conclusions:

  • The findings suggest a potential decline in health among long-term Pacific migrants in New Zealand, possibly influenced by immigration policies, socio-cultural integration, and host culture impacts.
  • Identifying modifiable factors contributing to this long-term health decline is vital for public health policy and the well-being of Pacific communities.