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In contrast with intercensal estimates and censuses, which usually involve some sort of field data gathering, projections usually involve mathematical models based only on pre-existing data may be made by a governmental organization, or by those unaffiliated with a government.
- Directorate, OECD Statistics. "OECD Glossary of Statistical Terms – Population projections Definition". stats.oecd.org.
- "Definition of INTERCENSAL". www.merriam-webster.com.
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