Case study: Turkish Statistical Institute

Currently the metadata system consists of the reference metadata published on the website and the metadata stored in production databases in DDI format. In addition to these two main systems, there are also other metadata kept in isolated systems.

Reference metadata about statistics are published in Turkstat’s web page in SDDS format. Definitions of variables and concepts about statistical data are published in the web page for each statistics/product separately. The classification server is accessible through the web. It contains the national and international classifications (http://tuikapp.tuik.gov.tr/DIESS/ChangeLocaleAction.do?dil=en).

In 2012 TurkStat began to use a DDI tool to catalogue metadata. This new tool holds the reference metadata for surveys along with the structural metadata. The structural metadata (datasets and variable groups) is used as an input by the Harzemli system to create electronic survey forms. Therefore the data structure defined in the metadata editor is directly used in one of the components of the production system.

A comprehensive metadata management system is designed to cover the components of both ESMS and ESQRS, as well as all other metadata that is produced within the organization stored in various places and managed by using different tools. The new system is planned to be built in phases, and planned to provide a link among different sources of metadata.

Structural metadata: This type of metadata is used to define the data structures. Variable names, classifications, standard code lists, variable types,  data set definitions are parts of the structural metadata.

Reference metadata: The metadata that describes the content and quality of statistical data. The aim and scope of the study, data collection and processing methods, quality indicators are parts of the reference metadata.

TurkStat metadata system consists of various independent components. These components are listed below.

TurkStat Web Content Management System: Reference metadata for statistical data is disseminated in SDDS format in TurkStat’s web site.

Institutinal Quality Report Module: Quality reports are available for selected statistics. These reports are available to internal users.

Classifications Server: National and international standard classifications and internal standard code lists are managed and accessed through the classification server in TurkStat’s web page. http://tuikapp.tuik.gov.tr/DIESS/ChangeLocaleAction.do?dil=en

Metadata Editor and Harzemli: Reference and structural metadata for surveys are entered into the metadata editor in DDI format. Harzemli system uses structural metadata from metadata editor to generate electronic data entry forms for surveys. Harzemli is not only a data entry platform, it has functionalities for data editing, cleaning and processing as well.

NADA: NADA is used to publish reference and structural metadata information about the surveys, which are entered using the metadata editor in DDI format. Also there are additional methodology and other documentation made available through NADA. Currently NADA is open to internal users only.

Field Checklist for Surveys: The main objectives of the Checklist are; i) to make systematic quality control of the field work,  ii) to identify the problems and deficiencies encountered during data collection by using built-in reports, iii) to take necessary measures to overcome the problems and to take improvement actions for the following surveys.

Process Metadata: Business processes are being modelled using ARIS. Statistical processes are modelled using GSBPM and non-statistical processes are going to be modelled using GAMSO.

Production Process Calendar (PPC): PPC is used to organize and manage the statistical production process, with a focus on data collection process. PPC allocates the workload throughout the year, specifies who (what department or unit) is responsible for what task and when the deadlines are for the tasks. The calendar is accessible through the intranet which is open to central and regional units.

Document Repository: Documentation of surveys, statistics, projects and the other main tasks carried out within the organization.. A repository to publish these documents is a work in progress.

Revisions: Revisions that have been done in the past 25 years are published in TurkStat’s web site for each statistics.

Official Statistics Portal: The official statistics disseminated by TurkStat as well as other government institutions are accessible through this portal. http://www.officialstatistics.gov.tr/?q=en

National Data Release Calendar: Publication dates and times of official statistics are announced in advance by National Data Release Calendar . This calendar helps to provide the timely release of official statistics by all institutions within the scope of the Official Statistics Programme. The National Data Release Calendar has been  prepared since 2007 by Turkish Statistical Institute in coordination with other institutions, and the calendar is updated on an annaul basis.