1. The French Rolling Census

2. 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

3. 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

4. THE METHOD OF THE NEW CENSUS
Two major principles
Data collection in rotation
Resorting to sample surveys for large communes (more than inhabitants)
The sampling base: the located buildings register (répertoire d’immeubles localisés - RIL)
Special case of persons not living in ordinary dwellings

5. SAMPLING STRATEGY Communes of less than 10 000 inhab. :
~ 30 M inhab. x 1/5 x 100 % = 6 M
Communes of inhab. Or more :
~ 30 M inhab. x 1/5 x 40 % = 2.4 M
Total : 8.4 M soit ~ 60 M / 7

6. 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 inhabitants :

8. 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…

10. In 2009, we start again … ONE YEAR OF COLLECTION FOR EACH COMMUNE
(example of Bas-Rhin)
Communes concerned each year ( inhabitants or more)
"communes 2004«  (less than de inhabitants)
"communes 2007" (less than inhabitants)
"communes 2008" (less than inhabitants)
"communes 2006" (less than inhabitants)
"communes 2005" (less than inhabitants)
Haguenau
Strasbourg
Sélestat
Saverne
In 2009, we start again …

12. A GROUP OF BUILDINGS CONCERNED EACH YEAR
And in 2009, we start again … 3

13. 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

14. 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

15. 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

16. THE ESTIMATION MECHANISM
Communes with less than inhab. :
Exhaustive census every 5 years
Population updated by :
Interpolation-extrapolation
Taking into account administrative sources (Housing Tax files)
Communes with 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)

17. 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

18. 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)

19. 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

20. A STRENGTHENED PARTNERSHIP WITH THE COMMUNES
The Communes prepare and perform the census survey
The Insee organises and checks data collection
Together :
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

21. A STRENGTHENED PARTNERSHIP WITH THE COMMUNES
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

22. THE PROCEEDINGS OF THE CENSUS SURVEY
The same modus operandi as in 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

23. The questionnaires
The dwelling data sheet
The individual bulletin

24. 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

25. 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

26. 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

27. 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

28. 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

29. REGULARITY
Criteria met by construction because one supplies annual data

31. THE SCHEDULE OF A CAMPAIGN
Sep.
Juin
Jui.
Août
Oct.
Nov.
Déc.
Mar
Avril
Mai
Jan
Fév.
Year N-1
Year N
Oct.
RIL Expertise
Sampling
Setting-up of organisation
Preparation
Training
Communication
Collection
Reception
Controls
Data processing
Dissemination