Use this migration measure when origins, destinations, reference periods, and the distinction between moves, movers, stocks, and flows are explicit.

Return migrants

In-migrants who previously lived in the destination.

Total in-migrants

All in-migrants to the destination over the period.

Return %

Return migrants as a percent of all in-migrants.

Migration estimates are sensitive to boundary changes, return moves, duration thresholds, missing origin-destination cells, and whether the source records residence, birthplace, or events.

Compare flow-based estimates with residence or birthplace stocks and, where possible, an independent residual method. Gross inflows and outflows reveal movement that a net balance alone conceals.

• Census Survival Migration Estimate

  Estimate intercensal net migration for an age cohort as the observed cohort at the second census minus the survivors implied by applying a national life-table census survival ratio to the first-census cohort.

• Lifetime Vs Recent Migrant Ratio Lookup

  Compare migration persistence by dividing lifetime migrants (born elsewhere) by recent migrants who moved within a stated interval.

• Migration Effectiveness Index EM Calculator

  Compute the migration effectiveness index as the sum of absolute regional net inflows divided by total migration turnover of an origin-destination matrix.