Rogers Castro Age Profile Lookup
Evaluate the seven-parameter Rogers-Castro migration schedule m(x) = a1 exp(-alpha1 x) + a2 + a3 exp(-alpha2 |x - mu2|), covering the childhood decay, baseline level and labor-force peak, at any requested ages.
Description
Evaluate the seven-parameter Rogers-Castro migration schedule m(x) = a1 exp(-alpha1 x) + a2 + a3 exp(-alpha2 |x - mu2|), covering the childhood decay, baseline level and labor-force peak, at any requested ages.
Evaluate the seven-parameter Rogers-Castro migration schedule m(x) = a1 exp(-alpha1 x) + a2 + a3 exp(-alpha2 |x - mu2|), covering the childhood decay, baseline level and labor-force peak, at any requested ages.1
When to use Rogers Castro Age Profile Lookup
Use this migration measure when origins, destinations, reference periods, and the distinction between moves, movers, stocks, and flows are explicit.
- Ages
- Ages in years at which to evaluate the schedule.
- a1
- Childhood-term amplitude a1.
- alpha1
- Childhood-term decay slope alpha1.
- a2
- Constant baseline intensity a2.
- a3
- Labor-force peak amplitude a3.
- alpha2
- Labor-force slope alpha2.
- mu2
- Labor-force peak location mu2 in years.
How the method works
- m(x)
- Fitted migration rate at each requested age.
Limitations and assumptions
Migration estimates are sensitive to boundary changes, return moves, duration thresholds, missing origin-destination cells, and whether the source records residence, birthplace, or events.
Alternative or Complementary measures
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.
References
-
Human migration — Wikipedia contributors
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