Organised by

1
Workshop on Census Data Processing Contemporary
Technologies for census Data Capture and Data
Editing

• Organised by
• United Nations Statistics Division (UNSD) in
  conjunction with the National Bureau of
  statistics (NBS)
• Dar es Salaam , Tanzania, 9 13 June 2008

2
Country ReportPresented by

• Mrs. N.Gujadhur
• Central Statistics OfficeMauritius
• June 2008

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Islands of Mauritius and Rodrigues

• Capital Port Louis
• Population 1.26 mn
• Population growth rate 0.6
• Area 2,040 km2
• Population density 616 persons/km2
• Monetary unit MRupees
• Literacy rate 85
• Languages English French

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Outline

• Census taking in Mauritius
• Core topics covered in 2000 HPC
• Editing and coding
• Data Processing
• Data Capture Outsourcing
• Data Validation Tabulation
• Problems

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Census taking in Mauritius

• 1st complete Census in the Island of Mauritius
  was undertaken in 1735
• Since then, censuses have been taken in 1846,
  1851 and every 10 years up to 1931.
• After the 2nd World War, the ten-yearly programme
  was resumed and Housing and Population censuses
  were undertaken in
• 1952, 1962, 1972,
• 1983, 1990 and 2000
• Next census gt 2010

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Census Organisation/Documentation

• The 2000 Housing Population Census (HPC) was
  conducted in the Island of Mauritius, Rodrigues
  and Agalega.
• Enumeration forms, Instructions codebooks were
  the main source of documentation used during the
  HPC.
• 1st round - Housing Census
• Chief Enumerators enumerated all buildings,
  housing units, households, commercial
  establishments, hotels, institutions etc.
• Enumeration Books, each containing 25 Housing
  forms.

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Census Organisation/Documentation (Contd)

• 2nd round - Population Census
• Enumerators enumerated all persons present on
  census night as well as usual residents who were
  away on census night.
• A Population questionnaire was used to collect
  information.
• Details instructions were provided to
  Supervisors, Chief Enumerators and Enumerators.
• A Census Guide and Instructions was also given
  to head of household for completing the
  Population questionnaire.

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Principles and Recommendations for Population and
Housing Censuses

• The Core Topics covered in the 2000 Housing
  Census were
• Type of living Quarters
• Location of living quarters
• Occupancy status
• Type of Ownership
• Numbers of rooms
• Water supply system
• Toilet
• Sewage disposal
• Bathing facilities

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Principles and Recommendations for Population and
Housing Censuses (Contd)

• Core Topics for Housing Census
• Availability of kitchen
• Fuel used for cooking
• Type of lighting/Use of electricity
• Solid waste disposal
• Number of Occupants
• Type of tenure
• Type of building
• Construction material of outer walls

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Principles and Recommendations for Population and
Housing Censuses (contd)

• The recommended core topics covered in the 2000
  Population census were
• Geographical and Internal Migration
  characteristics
• - Place of usual residence and place where
  present at time of census
• International Migration characteristics
• - Citizenship
• Household and Family characteristics
• - Relationship to head
• Demographic and Social characteristics
• - Sex, age and Marital status

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Principles and Recommendations for Population and
Housing Censuses (Contd)

• Fertility and Mortality characteristics
• - Children ever born
• Educational characteristics
• - Literacy, School Attendance and School
  Attainment
• Economic characteristics
• - Activity Status, Occupation, Industry and
  Status in Employment
• Disability characteristics
• - Disability status

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Editing and Coding Housing Census

• Housing Census questionnaires started during the
  2nd week of March 2000 and was completed during
  the 1st week of May.
• 30 editors and coders and 3 supervisors and about
  310,000 Housing Census forms were edited and
  coded.
• ½ day training for the editors and coders.
  Training was an on going process. Short
  briefing sessions were conducted as and when
  needed.

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Editing and Coding Housing census (contd)

• Editing and coding was done manually.
• (i) Verified that geographical identifiers on the
  cover of booklets making the EA batch were the
  same.
• (ii) Consistency checks of block numbers,
  building numbers within blocks as well as the
  housing units within buildings were then
  performed.

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Editing and Coding Housing census (contd)

• (iii) Some examples of the consistency checks
• - if Roof concrete slab, then
  Walls should also be stone, concrete,
  concrete blocks, and bricks.
• - if Bathing Facilities is marked, then HU3
  Water Supply should be Piped water inside
  housing unit.
• - Ensure that the no. of Male and Female in
  column No. of persons add up to Total.
• - if tenure Owner or free, monthly rent
  should be zero

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Editing and Coding Population Census

• Population Census questionnaires started August
  2000 and was completed in May 2001.
• 50 editors and coders were involved and about
  300,000 Census forms were edited and coded.
• ½ day training for the editors and coders.
  Training was an on going process. Short
  briefing sessions were conducted as and when
  needed.

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Editing and Coding Population Census (contd)

• Editing coding of the Population Census forms
  was more complex and time-consuming than that of
  the Housing Census forms
• Verification of the EA batches consisted of
  checking that all census forms in a given batch,
• appropriate geographical codes were inserted on
  unaddressed forms,
• consistency checking and editing of the
  individual forms according to 2000 Population
  census - Editing Coding Instructions.

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Editing and Coding Population Census (contd)

• Some example of the checks
• Check that there is one and only one head in
  every household.
• Check the number of family nuclei
• Check for possible inconsistency between name,
  relationship and sex for every person.
• Check that age is consistent with date of birth.
• Check marital status with age.
• Check if age at first marriage is gt 10 years
• Check number of children ever born with age and
  sex.
• Check education and highest qualification with
  age.
• Check the internal consistency of the information
  on economic activity.

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Editing and Coding Population Census

• Coding of Housing Population Census
• International Classifications adapted to the
  country
• National Classification of Occupations (Based on
  ISCO 88)
• National Standard Industrial Classification of
  Economic Activities (Based on ISIC Rev. 3, 1990)
• Codes for Vocational/technical/tertiary
  qualification (Adapted from ISCED)
• Locality codes and country codes

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Data Processing

• The processing of the HPC data were done along
  the same lines, although the various operations
  involved in the processing were somewhat more
  complex for the PC than for the HC.
• Data capture
• Data validation and updating of data files
• Production of address labels from Housing Census
  files and printing of labels
• Tabulation.

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Data Capture Outsourcing

• Data capture for the 2000 HPC was outsourced to
  another government organisation
• - The Central Statistics Office (CSO) does
  not have its own full-fledged IT department
  and - personnel capable of undertaking data
  capture activities.
• Data entry was done by operators of the Central
  Information Systems Division (CISD) of the
  Ministry of Information Technology and
  Telecommunications.

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Data Capture Outsourcing (contd)

• The data entry staff was composed of 28 operators
  and 5 supervisors.
• The Data Entry operators were given a short
  training before starting the work, and short
  session were conducted as and when needed.
• Coded questionnaires were sent to the CISD in EA
  Batches for data capture.
• All Housing and Population Census questionnaires
  were verified i.e. Double entry.

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Data Capture Housing Census

• Software used was IMPS 4.1 (Integrated
  Microcomputer Processing System) of the
  International Programs Center of the US Bureau of
  the Census.
• The data entry exercise of about 310,000 HC forms
  started in March 2000 and was completed in May
  2000.
• Names and addresses of head of households were
  used as a frame for the Population Census
  enumeration.

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Data Capture Population Census

• Data capture for the Population Census started in
  September 2000 and was completed in July 2001.
• Data for around 300,000 Population Census forms
  containing about 1,200,000 records were keyed in
  during that period.
• The CISD had recourse to extensive after-office
  work to complete the data entry exercise within
  reasonable time limits.

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Data validation

• A validation programme was run to identify
  records with errors.
• Listings of these records were produced relevant
  census forms were retrieved and corrections were
  made accordingly.
• Data files were updated.
• Once validation of all data files was completed,
  the data files were concatenated to the country
  level.

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Tabulation

• Tabulation was done using the CENTS module of
  IMPS.
• A preliminary set of publication tables was
  produced using the country data file.
• A list of relevant edit specifications was drawn
  and incorporated in a CONCOR programme to remove
  the inconsistencies from the tabulated data.
• Table reports for Housing Census were completed
  in October 2000 and for Population Census in
  October 2001.
• All publications are posted on the office
  website at the following address
  http//statsmauritius.gov.mu.

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Problems encountered during the 2000 HPC

• Problems of shortage of staff were met at various
  stages of the census operation, causing delays on
  the time schedule. ( Fieldstaff, editors and
  coders, data entry operators)
• As regards data capture, this was done by the
  Central Information System Division of the
  Ministry of IT and very often the census work was
  not given priority over other work thus resulting
  in delays.

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Thank you