The quality of age data from some recent arab population censuses
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The quality of age data from some recent Arab population censuses . First Conference of Al Khawarezmi in the Arab States Ismail Lubbad Doha, 6-8 December 2010. Introduction Census in ESCWA countries- An overview Objectives, data source and methodology Results Age-sex reporting

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The quality of age data from some recent arab population censuses l.jpg

The quality of age data from some recent Arab population censuses

First Conference of Al Khawarezmi in the Arab States

Ismail LubbadDoha, 6-8 December 2010


Contents l.jpg

Introduction censuses

Census in ESCWA countries- An overview

Objectives, data source and methodology

Results

Age-sex reporting

Sex ratio with age

Age heaping - digit preference

Conclusion

Contents


Introduction l.jpg

Importance of population census data censuses

Stock data for population estimates/projections

Data for sampling frames

Only source of data on small areas (localities)

Long history of census taking in the region

Quality of census data – rarely evaluated

Importance of age and sex data

Introduction


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Census taking in ESCWA countries censuses

Table 1: Census taking in ESCWA countries


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Objectives and Methodology censuses

  • Objectives: To examine the accuracy of age-sex reporting and the patterns of digit preference in censuses of population in (ESCWA) Arab countries.

  • Source of data: Tables on age-sex reporting from the two most recent censuses - NSOs

  • Methods: Descriptive analysis – common indices:

    • UN age-sex accuracy index,

    • Whipple-type indices

    • and descriptive charts

      Software: Population Analysis Spreadsheets (PAS)


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Results censuses

Table 2: Age-sex non-reporting in population census in ESCWA countries


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Accuracy of age-sex reporting censuses

  • United Nations Age-Sex Accuracy Index measures sex-specific omission of persons in addition to age misreporting

    • Based on 5 year age groups

    Criteria of the U.N. INDEX

    Under 20 → Accurate

  • to 40 → Inaccurate

    Over 40 → Highly Inaccurate


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UN age-sex Accuracy index censuses

Table 3: Results of UN Age-Sex Accuracy Index in ESCWA countries (nationals only)


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UN age-sex accuracy index (cont…) censuses

UN age-sex Accuracy index




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Age heaping and digit preference censuses

  • Data required: Population by sex and single year age

  • Index of measurement: Whipple's index


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Age heaping and digit preference censuses

  • Table 4: Totals of Whipple and Myer's Indexes in ESCWA countries





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Conclusion – Looking forward censuses

  • Preliminary results - PC 2010 will enrich the study and give a full picture;

  • Improvement in age reporting in all the countries

  • No problems in age heaping except for Yemen

  • Age sex structure is considered inaccurate in a number of the ESCWA countries


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Thank You censuses

lubbad@un.org