{"display_title": "Regional decline is modelled through three demographic components", "components": [{"component_name": "paragraph", "paragraph": "The materials explicitly treat fertility, mortality, and migration as separate demographic components rather than as a single undifferentiated driver of population change. Statistics Norway's regional projections require assumptions about fertility, mortality, internal migration, immigration, and emigration; the resulting population path is therefore conditional on distinct component assumptions."}, {"component_name": "heading", "heading": "What makes the decomposition possible", "level": 2}, {"component_name": "list", "ordered": false, "list": ["**Component-specific vital and migration data.** The projections use aggregated individual-level population, births, deaths, and migration data from Statistics Norway's population statistics.", "**Geographic and demographic detail.** Inputs are organised by age, sex, and place of residence on 1 January each year, with births, deaths, domestic migration, immigration, and emigration additionally recorded by age, sex, and municipality or city district.", "**Whole-population coverage.** These are not sample estimates: the method uses the full population in its calculations.", "**Cohort-component modelling.** Once assumptions are specified, Norway's population is projected with the BEFREG cohort-component models. This framework applies separate assumptions for fertility, mortality, internal migration, and international migration to population groups defined by age, sex, and location.", "**Forecasting methods.** The Global Burden of Disease study likewise describes methods that forecast mortality, fertility, migration, and population as distinct but related quantities, supporting component-based demographic scenarios."]}, {"component_name": "heading", "heading": "Interpretive limits", "level": 2}, {"component_name": "paragraph", "paragraph": "The supplied text does not present a worked regional accounting table that quantifies how much of a specific area's observed decline was caused by fertility, mortality, or migration. It does state that projections are uncertain, especially because future immigration is difficult to project, while fertility, mortality, and internal migration may also differ substantially from assumptions. Regional results also cannot be compared directly across all publications because methods and regional boundaries have changed."}]}

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