Quality issues on the way from survey to administrative data:
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Andrej Vallo, Andrea Bielakova Statistical Office of the Slovak Republic Helsinki, 5 th May 2010 PowerPoint PPT Presentation


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Quality issues on the way from survey to administrative data: the case of SBS statistics of microenterprises in Slovakia. Andrej Vallo, Andrea Bielakova Statistical Office of the Slovak Republic Helsinki, 5 th May 2010. Background.

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Andrej Vallo, Andrea Bielakova Statistical Office of the Slovak Republic Helsinki, 5 th May 2010

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Quality issues on the way from survey to administrative data: the case of SBS statistics of microenterprises in Slovakia

Andrej Vallo, Andrea Bielakova

Statistical Office of the Slovak Republic

Helsinki, 5th May 2010


Background

Quality in OfficialStatistics2010

  • Official statistics in the Slovak Republic based predominantly on surveys

  • Use of administrative data for production of statistics limited

    • some in National Accounts and Social Statistics

  • General trends present in Slovakia

    • users’ demands vs. budget constraints and respondent burden

    • re-use of available data expected by respondents

  • If high quality and low costs are to be achieved, then production system based only on surveys is not sustainable

  • Adopted strategy: extensive use of administrative data

  • Starting with the most problematic survey: annual SBS survey of microenterprises


Quality issues in SBS statistics

Quality in Official Statistics 2010

Three annual SBS surveys

Survey of microenterprises – data not published due to quality issues

Low response rate, large proportion of allegedly inactive units, estimates likely to be biased


Outline of a solution

Quality in Official Statistics 2010

  • Target solution: Use of annual income tax returns data for

    • replacement of the survey (complete or partial), or

    • improvement of the estimates

  • Building on Phare project – complete documentation of available administrative data sources (content, structure, maintenance and accessibility)

  • First step: a feasibility study

    • if and how the tax data can be used for SBS

  • Assessment of the tax data quality - essential precondition of success

  • Administrative data quality assessment framework was needed


Administrative data quality assessment frameworks

Quality in Official Statistics 2010

  • Lack of generally adopted AD quality assessment framework

  • Different approaches:

    • Development of theoretical background (Wallgren and Wallgren, 2007)

    • General rules and recommendations (Eurostat 2003, Statistics Finland 2007, UNECE 2008, ESQR 2009, EHQR 2009...)

    • Individual countries’ quality assessment frameworks (ONS, Statistics Netherlands, Istat...)

  • Diverse selection of dimensions, diverse understanding of dimensions and various indicators

    • different degree of correspondence to Code of Practice

    • different degree of standardisation and formalisation

  • Input oriented and output oriented indicators


A feasibility study of tax data use for production of statistics

Quality in Official Statistics 2010

  • Selection and prioritisation of indicators

  • Input oriented indicators

    • no experience with production of statistics from the data

  • Core indicators (necessary conditions):

    • Coverage and linkability of the data

    • Availability and comparability of the variables

  • Additional indicators:

    • Target population

    • Definition and identification of survey units

    • Timeliness and reference period

    • Structure and format of the data

    • Metadata and clarity


Coverage and linkability issues

Quality in Official Statistics 2010

  • Tax returns data come in four separate files

    • Main Form, Profit & Loss Statements, Balance Sheets, Tax Register

  • Different identifiers: Unique identifiers of taxpayers different from universally used identifiers of enterprises

    • the link between them established in the Tax Register

  • Overcoverage in the Main Forms data

    • linking with data from Statistical Business Register needed for selection of the units from target population

  • Undercoverage in the P & L Statements and Balance Sheets

    • available for 55% of the target population

  • Incompleteness of the Tax Register (80% of the units)

  • Errors in links between the identifier systems


Availability of variables (turnover related)

Scopeofthevariables

Levelof detail in the variables

Quality in Official Statistics 2010


Comparability of variables

  • Comparison of the values of Total turnover provided in the survey and in the tax return (P & L Statement)

  • Definitions of the variables correspond to each other exactly

  • The values differ in almost 40% of the comparisons

Distribution of non-zero differences less than 10%

Quality in Official Statistics 2010


Conclusions and next steps

Quality in Official Statistics 2010

  • The identified issues do not allow to use the data directly

  • The Tax register has to be completed and errors in links removed

  • Further checks have to be applied to ensure internal consistency of the tax data

  • Models for estimation of missing variables have to be designed afterwards

  • This will be done in three steps:

    • Estimation of variables from the P & L statements for the units where these data is missing to ensure complete and correct administrative data

    • Editing of the data to ensure consistency between tax data and survey data

    • Estimation of variables for SBS and National Accounts


Thank you for your attention... comments, questions or suggestions are warmly welcome 

Quality in Official Statistics 2010


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