Dual System Chandrasekar Deming Estimator
Estimate total population size and undercount from two incomplete enumeration lists using the Chandra Sekar-Deming dual-record estimator N-hat = (a+b+1)(a+c+1)/(a+1) - 1 with the one-per-cell continuity correction.
Description
Estimate total population size and undercount from two incomplete enumeration lists using the Chandra Sekar-Deming dual-record estimator N-hat = (a+b+1)(a+c+1)/(a+1) - 1 with the one-per-cell continuity correction.
Estimate total population size and undercount from two incomplete enumeration lists using the Chandra Sekar-Deming dual-record estimator N-hat = (a+b+1)(a+c+1)/(a+1) - 1 with the one-per-cell continuity correction.1
When to use Dual System Chandrasekar Deming Estimator
Use this method when reconciling census counts, coverage, or intercensal components that share clearly stated reference dates and population definitions.
- Both lists
- Records appearing on both lists.
- List 1 only
- Records appearing only on the first list.
- List 2 only
- Records appearing only on the second list.
How the method works
- Estimated total
- Estimated true total including persons missed by both lists.
- Missed by both
- Estimated number missed by both lists.
Limitations and assumptions
Census-based estimates inherit omissions, duplications, age misstatement, boundary changes, and differences in reference dates. A small closure error does not prove that every component is complete or unbiased.
Alternative or Complementary measures
Compare the result with a post-enumeration survey, administrative registers, vital-statistics residual, or a second coverage method. Agreement between methods is more informative than a single closure estimate.
References
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Census — Wikipedia contributors
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