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Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
The French Rolling Census
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
GENERAL PRESENTATION OF THE CENSUS
Why renovate The method of the new census The conditions for renewal More indepth consultation The cost of the census Enhanced partnership with the communes The different steps in the census survey Dissemination
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
WHY RENOVATE? To respond to more recent needs of statistics To smoothen the costs and the expenses (and
therefore, better staff and control the operations)
Renovation has enabled the consolidation of the legal edifice and the clarification of the partnership with the communes
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE METHOD OF THE NEW CENSUS Two major principles
Data collection in rotation Resorting to sample surveys for large
communes (more than 10000 inhabitants) The sampling base: the located buildings
register (répertoire d’immeubles localisés - RIL)
Special case of persons not living in ordinary dwellings
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
SAMPLING STRATEGY Communes of less than 10 000 inhab. :
~ 30 M inhab. x 1/5 x 100 % = 6 M Communes of 10 000 inhab. Or more :
~ 30 M inhab. x 1/5 x 40 % = 2.4 M Total : 8.4 M soit ~ 60 M / 7
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE SAMPLING FRAME IN LARGE COMMUNES: THE RIL A register of located addresses, in geographical co-ordinates:
The addresses of residential buildings, with variables such as the number of dwellings
The addresses of the local units of the enterprise register
The georeference in X and Y of each address Scope: The 892 communes of more than 10 000
inhabitants :
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
HOW IS THE RIL MAINTAINED A continuous update is necessary:
identification must be made of the new addresses, changed addresses and addresses destroyed Comparison with files: Building permit, files
of addresses of La Poste, Tax files… Exchange of data with the local authorities,
and operations of expertise of the communes Returns of census data collected, out of 8% of
addresses annually In the field verification…
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
ONE YEAR OF COLLECTION FOR EACH COMMUNE
In 2009, we start again …
(example of Bas-Rhin)
"communes 2008" (less than 10 000 inhabitants)
"communes 2007" (less than 10 000 inhabitants)
"communes 2006" (less than 10 000 inhabitants)
"communes 2005" (less than 10 000 inhabitants)
"communes 2004« (less than de 10 000 inhabitants)
Communes concerned each year(10 000 inhabitants or more)
Haguenau
Strasbourg
Sélestat
Saverne
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
A GROUP OF BUILDINGS CONCERNED EACH YEAR
And in 2009,we start again …
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE SAMPLING PLAN 2 strata = «addresses of large size» and « other
addresses » «addresses of large size» : 5 groups for rotation,
one group surveyed exhaustively each year « other addresses » : 5 groups for rotation, one
group sample surveyed each year Five groups balanced in terms of number of
dwellings, number of dwellings in collective housing, five age-groups and gender
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
SAMPLE OF THE YEAR We remove from the groups the addresses
disappeared We distribute the new addresses by seeking to
strike a balance in the number of dwellings and the breakdown between collective / individual housing
The group of the year of large size addresses is surveyed exhaustively
The group of other addresses of the year is sample surveyed to reach 40% of the group Criteria : number of dwellings and breakdown between
collective/individual, weight of the IRIS in number of dwellings
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE ESTIMATION PRINCIPLES Each year, for each commune, the estimation of
the population at 1st January N-2
Mobile averages for the large communes
Interpolation and extrapolation for the small ones
An update limited to two years maximum
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE ESTIMATION MECHANISM Communes with less than 10000 inhab. :
Exhaustive census every 5 years Population updated by :
Interpolation-extrapolation Taking into account administrative sources
(Housing Tax files)
Communes with 10 000 inhab. or more : Sample surveyed at 8 % every year, i.e. 40 % over
5 years Mobile sum over 5 years Fitted over the number of dwellings of the median
year (RIL)
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE CONDITIONS FOR RENEWAL The opportunities that we have benefitted from:
Statistical techniques enabling the construction of balanced samples
The possibility of building a Located Buildings Register - RIL (Répertoire d’Immeubles Localisés) to serve as a sampling base
Administrative sources of better quality, to contribute to the surveys and update the RIL
A « high confidence level » … indicate the conditions for success
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
AN INDEPTH CONSULTATION How to renovate : the consultation and the legal
edifice Laws and decrees National and local consultation (National
Council on Statistical Information –CNIS and the regional directorates)
Commission of the CNIS to prepare the decree (organisation of the census and the principles of the calculation of the legal population)
Scientific committee (validation of the method)
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE COST OF THE CENSUS No additional expenditure The total external cost : approx. 30 M€ per
annum (external costs), to compared with 200 M€ for a general census
The cost is therefore smoothened and is more « profitable » because one provides data each year
The non-financial charges are also smoothened
On the whole a better cost-advantage ratio
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
A STRENGTHENED PARTNERSHIP WITH THE COMMUNES
They co-manage the training of enumerators
They follow the data collection procedure
They control the quality and exhaustiveness of the data collection
They watch over the respect of confidentiality of the data they co-ordinate their communication actions
The Communes prepare and perform
the census survey
The Communes prepare and perform
the census survey
The Insee organises and checks data
collection
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
The partnership between Insee and the communes is better defined
The contributions : based on the closeness of the communes with the inhabitants which has proven its worth in the previous censuses
The professionalisation of the communal stakeholders : an essential factor of improvement
A STRENGTHENED PARTNERSHIP WITH THE COMMUNES
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
THE PROCEEDINGS OF THE CENSUS SURVEY The same modus operandi as in 1999 for the
habitants : deposit-withdrawal of the questionnaires by the enumerator
A « non surveyed dwelling form » (called FLNE in french) in case of impossibility of contacting people or refusal
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
The questionnairesThe dwelling data sheet
The individual bulletin
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
IN LINE WITH QUALITY CRITERIA The essential characteristics of the census
(defined by the UN) : Individual listing Universality Simultaneity Capacity to supply data on small fields Regularity
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
INDIVIDUAL LISTING Data for each individual and each household
interviewed in the census
Organised in a « detail » file allowing for all kinds of comparisons
Sampling rate sufficient for all kinds of cross-tabulations
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
UNIVERSALITY Guaranteed in the small communes because each
dwelling is interviewed in the census Guaranteed in the large communes by the RIL which
covers all the addresses of dwellings and by the sampling rate (40%)
The institutions (communities) are exhaustively interviewed
Homeless persons and those living in mobile homes, exhaustively interviewed for the census, are subject to an adapted data collection protocol
Data collection is controlled through a comparison with the Housing Tax files and with the RIL
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
SIMULTANEITY The annual survey takes place for all the
communes concerned at the same date
The data collected at different years are brought down to the same date, thanks to administrative files, or through a mobile average
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
CAPACITY TO SUPPLY DATA ON SMALL FIELDS Stems from both universality and individual
listing
Garanteed by the sampling rate (100% in the small communes and 40% in the large ones)
The census will supply data on all the communes and on the « IRIS », districts of about 2000 inhabitants
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
REGULARITY Criteria met by construction because
one supplies annual data
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
CENSUS STEPS
Located
buildings register
(R.I.L)
Data Collection Sampling
Data Collection preparation
Households Communities
Communities register Receipt, Checking
Restitution to the mayors Dissemination
Preparation of data entry
Validation
of the data
Estimation of datas :
population and detailed datas
Imputation of missing datas
Coding
Automatic then manual
recovery
Data entry
(external service provider)
Addition of the weights and updating of geography
Regional Workshop on the 2010 World Programme on Population and Housing Censuses: International standards, contemporary technologies for census mapping and data processing
Minsk, Belarus, 8-12 December 2008
Sep.Juin Jui. Août Oct. Nov. Déc. Mar JuinAvril MaiJan Fév. Sep.Jui. Août Nov. Déc. Jan
Year N-1 Year N
THE SCHEDULE OF A CAMPAIGN
Sampling
RIL Expertise
Setting-up of organisation
Preparation
Training
Communication
Collection
Reception
Controls
Data processing
Oct.
Dissemination