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On a microdemographic framework for decomposing contemporary fertility dynamics.

Stephen J Shaw1

  • 1Independent Researcher, Tokyo, Japan. sjs@xyworldwide.org.

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Summary

The Total Fertility Rate (TFR) hides crucial fertility details, losing 49% of information. New measures, Total Maternal Rate (TMR) and Children per Mother (CPM), offer clearer demographic insights.

Keywords:
Children per mother (CPM)Low fertilityMicrodemographic framework (MDF)Total childlessness rate (TCR)Total fertility rate (TFR)Total maternal rate (TMR)

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Area of Science:

  • Demography
  • Sociology
  • Public Health

Background:

  • The Total Fertility Rate (TFR) is a widely used metric but obscures underlying fertility dynamics.
  • Decomposition of TFR into its components can provide a more nuanced understanding of fertility trends.

Purpose of the Study:

  • To introduce and validate the Total Maternal Rate (TMR) and Children per Mother (CPM) as independent components of fertility.
  • To propose the Microdemographic Framework (MDF) for enhanced demographic analysis and policy evaluation.
  • To highlight the limitations of TFR and the benefits of using TMR, CPM, and Total Childlessness Rate (TCR).

Main Methods:

  • Analysis of aggregated birth data from over 158 million mothers in Italy, Japan, UK, and US.
  • Validation and extension using data from 156 million women across 29 higher-income economies.
  • Application of entropy analysis, explanatory power modeling, and wavelet coherence testing.

Main Results:

  • TFR results in a 49% information loss compared to decomposed components TMR and CPM.
  • TMR and CPM were found to be statistically independent, revealing ambiguity in TFR.
  • CPM remained stable, while TMR showed sharp declines, patterns masked by TFR.

Conclusions:

  • The Microdemographic Framework (MDF), comprising TMR, CPM, and TCR, offers superior analytical resolution compared to TFR.
  • The independence of TMR and CPM provides critical insights for demographic analysis and policy.
  • Reporting TMR, CPM, and TCR alongside TFR can facilitate more timely and targeted demographic decision-making, especially in low-fertility settings.