Diapositiva 1

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For a Population Statistical Register
Characteristics and Potentials for the Official
Statistics Central department for
administrative data and archives and statistical
registers
Roberta Vivio, Valentina Talucci, Grazia
Petraccone

Q8 European conference on quality in official
statistics Rome 9 11 luglio 2008
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Main objectives for using administrative sources
in the statistics
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Statistics

• To widen the available informative basis, in
  addition to the traditional surveys
• To reduce the statistical burden on households,
  enterprises and institutions
• To reduce the costs of the public statistics

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Quality Standard

• All national statistical institutes have a duty
  to produce official statistics with the highest
  possible quality with reference to
• Relevance and completeness
• Timeliness and punctuality
• Accuracy
• Comparability and clarity
• Cost efficiency
• Low response burden
• The standard indicators of quality in Istat are
  divided into process and product.
• Among those process component quality is the
  Accuracy in terms of
• coverage
• coding

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Hence, in this context, Istat proposes its
project to construct A statistical
register on persons living in Italy and
Specialised archives linked with this register
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Education and training
Work
Dwellings
Welfare
Health
Foreigners
Persons register
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• The projects phases involve to
• Select the primary input source to select the
  best list for the register
• reconnaissance study on existing archives
• control on their quality and informative
  potentials
• Plan the register
• study of the construction process
• study of the actions for identifying, measuring
  and correcting any error
• Experiment the application fields of the register
  together with other archives

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Base input source

• The Tax authorities individual register
• part of the Tax Informative System
• realized for the strategic objectives of the
  Ministry of Finance
• created and managed by the Tax Agency for the
  Ministry of Finance

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• Characteristics of the tax register
• 1) Population target
• Tax population
• (that is bigger than Resident Population
  Population of interest)
• 2) Statistical unit each person with a fiscal
  code
• (its the identification and linkage key)
• 3) Territorial detail address
• 4) Coverage all Italian municipalities
• 5) Administrative and statistical link between
  the tax register and legally resident population
  register

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• Population target and Statistical Unit
• The TAX POPULATION of a municipality
• is made up of Italian and/or foreign persons
• - Legally resident in the municipality
• - Not legally resident in the municipality, but
  having a fiscal code based on actions they carry
  out that involve the obligation to use such code
  (taxpayers)
• In other words
• DOES NOT include persons
• NON-resident and fiscally NON-domiciled

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Link with the legally resident population
register Populations identifiable in the Tax
Population ALIGNED POPULATION the population
whose data held in the tax register coincide with
those held in the legally resident population
register
is primary input of
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• The quality test
• The sample
• 3.8 millions of records
• 8 Municipalities
• 12 variables
• Fiscal code
• Name, surname
• Sex
• Date of birth
• Municipality of birth (cadastral code)
• Fiscal address
• Municipality (cadastral code)
• Address
• Legally residence (ONLY IF different from the
  tax domicile)
• Municipality (cadastral code)
• Address

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THE TEST quality assessments on macro
data (coverage and matching errors in relation to
the objectives population, non-responses)
Formal and substantial controls Statistical
indicators Simple distance index Simple
distance index () Index of dissimilarity (simple
and relative) Index of dissimilarity (simple and
relaive for ordered characters) Coefficient of
correlation Demographic indicators Mean
Age (of the population) Birth Rate Sex Ratio
Dependency Ratio Etc.

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• TEST ON MICRO-DATA
• confirms
• integrates
• qualifies the units eligible for the register

Tax register


LINK
Business register physical persons Archive
of Retired Persons Tax archive on employee
Birth registration
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• SOME RESULTS

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• Fields of application
• examples of linkage
• of the primary archive
• with some specialized archives

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Tax register Archives of work and pension
incomes
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Tax register Archives of work and pension
incomes

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Tax register Archive of retired persons
Resident retired persons in the I Quarter of
Rome by age and number of pensions Year 2004
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Some possible application for the Population
Register For sample surveys direct
sampling of persons For the archives
Statistical system on persons based on the
interaction of several specialized registries on
one base register For the census
Constitution of auxiliary lists (Italians and
foreigners)
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In addition. Check and/or integration of
alphabetical, numerical and alphanumeric items of
other surveys e.g. Place of birth in the
Census Municipality of residence in the
register of retired persons
.

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Conclusions The statistical population
register is a tool that will help to improve the
official statistics on the population. To have
the address allows to develop analisys at very
detailed territorial reference The important
information from the tax register becomes even
more important when considering that to have the
fiscal code represents also the first step
towards a complex informative system up until now
only imagined.
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Coverage errors Children in Rome
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Correction strategy Integration with the
micro-data from the archive Birth registration
Resident population per year of birth.
Municipality of Rome. Years
2001 - 2006. Various sources.
Tax Agency
Istat
Coupling Total Pop. Birth registrations
Aligned
Population
Posas
population
Total
24487
---
24962
---
2006
2005
21273
26576
23360
23531
2004
14452
26673
25567
25212
2003
12592
26372
25064
25269
2002
13498
25799
23332
24435
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The First Statistical Population register in
Italy is considered at the moment to be among the
most innovative ones in Istat in particular
its a product innovation as it will become the
First National register of Persons to be
available to the Institute. Up until now, the
Institute could count only on non-individual
register information and more than 8 thousand
municipalities. In addition, it is also a
process innovation to construct it, a source
that despite being originally created for tax
administrative sources, will indeed be used for
demographic purposes.
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Populations identifiable with the tax Population
AGGREGATES AGGREGATES AGGREGATES AGGREGATES AGGREGATES
AGGREGATES Aligned population Population not yet aligned Population that cannot be aligned Total
AGGREGATES a b c T
Tax population X X X Tabc
Resident population X X ? Tab