Visual Demography

Interactive instruments for exploring formal demography: life tables, stable population theory, projection, kinship, and multistate models — with the mathematics made visible.
vis·u·al AmE /ˈvɪʒ.u.əl/ · BrE /ˈvɪʒ.u.əl/ adjective Relating to seeing or sight; perceived or presented in a form the eye can read.
for·mal de·mog·ra·phy AmE /ˈfɔːr.məl dɪˈmɑː.ɡrə.fi/ · BrE /ˈfɔː.məl dɪˈmɒɡ.rə.fi/ noun The study of demographic quantities — fertility, mortality, migration, age structure, and population growth — as a self-contained system, through the internal relationships among them and apart from their social, economic, or biological causes.

The mathematics of population, made to explore.

Visual Demography works in that formal tradition to build interactive pieces for learning. Each piece exposes the parameters of a single model (a life table, a stable population, a projection, a kinship network) so that changing an assumption changes the result on screen. Inputs may be observed, stylized, or reconstructed, and each companion names which.

These are explanatory instruments, not research findings. They apply standard demographic methods to show how rates and structures propagate through formal models. Stylized or reconstructed inputs are flagged on each companion page.

Demographic Flux

Demographic Flux — Lexis surface showing cohort age structure to 2100, with warm–cool gradient encoding the shift from young to aging populations

Cohort-component Lexis simulation from observed HMD/HFD country profiles — stylized forward scenario, not recorded national history after the base year.

Choose a country profile, then explore how the observed base-year age structure and vital rates evolve under Lee–Carter mortality and a parametric fertility path; strip panels trace birth and death rates together, crude growth rate, and the first demographic dividend.

HMD + HFD · Sweden (1900), Canada (1921), Switzerland (1932), and Denmark (1916) profiles

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