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1 For a Population Statistical Register Characteristics and Potentials for the Official Statistics Central department for administrative data and archives and statistical registers Q8 European conference on quality in official statistics Rome 9 – 11 luglio 2008 Roberta Vivio, Valentina Talucci, Grazia Petraccone

1 For a Population Statistical Register Characteristics and Potentials for the Official Statistics Central department for administrative data and archives

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Page 1: 1 For a Population Statistical Register Characteristics and Potentials for the Official Statistics Central department for administrative data and archives

1

For a Population Statistical Register

Characteristics and Potentials for the Official Statistics

Central department for administrative data and archives and statistical registers

Q8 European conference on quality in official statistics Rome 9 – 11 luglio 2008

Roberta Vivio, Valentina Talucci, Grazia Petraccone

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• 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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on Quality in

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Main objectives for using administrative sources in the statistics:

Roma, 9-11 Luglio 2008

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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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on Quality in

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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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Persons register

Education and training

Work

Welfare

Health

Dwellings

Foreigners

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The project’s 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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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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on Quality in

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Base input source

Roma, 9-11 Luglio 2008

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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 (it’s 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

“ALIGNED” POPULATION

Statistical register on persons

is primary input of

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on Quality in

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11

The quality testThe 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

Source of the fiscal code, tax domicile, Legally residence

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on Quality in

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Roma, 9-11 Luglio 2008

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THE TEST: quality assessments on macro data(coverage and matching errors in relation to the objective’s

population, non-responses)

Formal and substantial controls;***

Statistical indicators:

Simple distance indexSimple 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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on Quality in

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Roma, 9-11 Luglio 2008

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Business register – physical persons Archive of Retired Persons Tax archive on employee

Birth registration

Tax register

LINK

TEST ON MICRO-DATA

• confirms

• integrates

• qualifies the units eligible for the register

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Official Statistics

Roma, 9-11 Luglio 2008

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SOME RESULTS

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Dissimilarity index Tax Population VS Official Istat Population Population by year

Index

Municipalities Simple

distance index

Simple distance

index (%)

Index of dissimilarity (simple and

relative)

Index of dissimilarity (simple and relative for

ordered characters)

Coefficient of correlation

Bologna 8,7 2.3 0.033 0.010 0.999 Capri 215,0 2.9 0.013 0.003 0.997 Firenze 7,4 2.0 0.010 0.003 0.999 Monopoli 1,8 3.6 0.006 0.002 1.000 Padova 10,0 4.7 0.012 0.003 0.997 Roma 146,6 5.7 0.027 0.006 0.988 Salerno 11,3 8.4 0.034 0.016 0.988

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European Conference

on Quality in

Official Statistics

Roma, 9-11 Luglio 2008

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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

Nati in Italia

Nati all'Estero Nati in Italia

Nati all'Estero

Nati in Italia

Nati all'Estero

Nati in Italia

Nati all'Estero

89,1 10,9 95,4 4,6 51,1 48,9 67,2 32,8

92,9 7,1 53,9 46,1Nati in Italia Nati Estero Nati Estero

17,3

Nati in Italia

40,3 59,7 82,7No reddito Si reddito No reddito Si reddito

Allineati75,6

Non allineati 24,4

Roma, 9-11 Luglio 2008

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Tax register &

Archives of work and pension incomes

0,0

5,0

10,0

15,0

20,0

25,0

0-4 5-9 10-14

15-19

20-24

25-29

30-34

35-39

40-44

45-49

50-54

55-59

60-64

65-69

70-74

75-79

80-84

85-89

90-94

95-99

100e

piu'

foreign countries

Non legally resident persons with work and/or pension income, by age and place of birth %

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on Quality in

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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

0

2.000

4.000

6.000

8.000

10.000

12.000

14.000

meno d

i 5

05-0

9

10-1

4

15-1

9

20-2

4

25-2

9

30-3

4

35-3

9

40-4

4

45-4

9

50-5

4

55-5

9

60-6

4

65-6

9

70-7

4

75-7

9

80-8

4

85-8

9

90-9

4

95+

pensionati

pensionati 1 P

pensionati 2P

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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

Maschi Femmine Totale Maschi Femmine Totale

2007 294 315 609 - - -

2006 12.532 11.955 24.487 12.807 12.155 24.962

2005 11.136 10.137 21.273 12.141 11.219 23.360

2004 7.381 7.071 14.452 12.970 12.597 25.567

2003 6.412 6.180 12.592 12.747 12.317 25.064

2002 6.897 6.601 13.498 11.388 11.944 23.332

2001 7.466 6.981 14.447 11.147 10.592 21.739

2000 11.193 10.423 21.616 11.594 10.828 22.422

1999 11.664 11.128 22.792 11.252 10.791 22.043

1998 11.907 11.161 23.068 11.333 10.623 21.956

1997 11.738 11.076 22.814 11.144 10.537 21.681

Popolazione residente per sesso e anno di nascita, confronti Agenzia delle entrate e Posas. Roma.

PosasAgenzia delle EntrateSESSOANNO

DI SESSO

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Correction strategy: Integration with the micro-data from the archive “Birth registration”

Istat

Aligned

population

Population

Total Posas

Coupling Total Pop.Birth registrations

2006 24487 --- 24962 ---

2005 21273 26576 23360 23531

2004 14452 26673 25567 25212

2003 12592 26372 25064 25269

2002 13498 25799 23332 24435

Resident population per year of birth. Municipality of Rome. Years

2001 - 2006. Various sources.

Tax Agency

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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 it’s 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

“Aligned” population

Population not yet “aligned”

Population thatcannot be “aligned”

Total

a b c T

Tax population X X X T=a+b+c

Residentpopulation

X X T=a+b