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Revision History

Statistics produced byTurkStat might be subject to change in context, coverage and methodology with the purpose of adapting to the economic, social and cultural conditions of the day. These changes might result in breakings in the time dimension for some statististics and for some statistics they result in backward calculations (majorrevisions) to eliminate the breakings. In order to ensure correctin terpretation of the statistics monitored by data users, academics and policy makers; these major revisions have to be taken into account.

Within this framework a study has been conducted to retrieve information regarding the breakings caused by changes in context, coverage and methodology and major revisions in the statistics produced by TurkStat in the last 30 years. An inventory which covers all of the statistical topics currently being published has been developed as a result of this study. Information filtered from this inventory is given below.

In this context breakings in 127 statistics produced between 1989 and 2019, and major revisions implemented to eliminate these breakings have been examined by reasons and timing. In 42 out of 127 products, breakings have been experienced in various years because of reasons such as methodological change, change in base year and classification and in order to eliminate these breakings major revisions have been implemented. On the other hand in 22 out of 127 products, there have been breakings but it was not methodologically eligible to eliminate them. In 63 of 127 products, no breakings have occurred and they are comparable in time.

It is observed that breakings have occurred mostly in and after 2005. Acceleration of improvements within the scope of compliance with European Union Statistical System in 2005 and especially the coming in to effect of Statistics Law of Turkey numbered 5429 in 2005 can be seen as the main reasons for this.


Table 1. Statistics where breakings are eliminated by major revisions

Products Breakings in the Last 30 Years Major Revisions Implemented to Eliminate Breakings
Years of The Breaking Reasons for The Breaking Has there been a major revision? Periods of major revision
Adult Education Survey 2017 Changes in classifications, definitions, coverage, methodology, implementation and questionnaire structure Yes In 2017, 2012 has been revised.
Annual Industrial Products (PRODCOM) Statistics 2010 Change in classification Yes 2005-2009 period has been revised.
2012 Change in source data Yes 2010-2011 period has been revised.
Annual Industry And Service Statistics 2003 Change in methodology and classification No -
2009 Change in classification Yes In 2009, 2003-2008 period has been revised.
Arriving Citizens Statistics 2012 Change in coverage and methodology Yes In 2012, 2003-2011 period has been revised.
Building Construction Cost Index 2007 Change in base year Yes In 2007, 2005-2006 period has been revised.
Building Permits 2004 Change in coverage Yes In 2004, 2002-2003 period has been revised.
2011 Change in coverage Yes In 2011, 2009-2010 period has been revised.
Central Government Budget Appropriations and Outlays on R&D 2017 Change in data source Yes In 2018, 2008-2016 period has been revised.
Construction Labor Input Indices 2010 Change in classification Yes In 2010, 2005-2009 period has been revised.
2013 Change in base year Yes In 2013, 2005-2012 period has been revised.
Construction Turnover and Production Indices 2010 Change in classification Yes In 2010, 2005-2009 period has been revised.
2013 Change in base year Yes In 2013, 2005-2012 period has been revised.
Consumer Tendency Statistics and Consumer Confidence Index 2013 Change in questionnaire, sub indexes and implementation period Yes In 2013, 2004-2012 period has been revised.
Note: Double implementation was carried out in 2012 and the results of the new implementation has been published since 2012.Thus 2012 data for the new time series is available.
Departing Visitors Statistics 2012 Change in coverage and methodology Yes In 2012, 2001-2011 period has been revised.
2012-2013 Change in coverage Yes In 2013, 3rd and 4th quarters of 2012 and 1st and 2nd quarters of 2013 have been revised.
Divorce Statistics 2003 Change in source data Yes In 2006, 2001-2002 period has been revised.
Note: In 2006, from 2003 onwards marriage and divorce statistics have been started to be compiled and published from MERNIS database.
Domestic Producer Price Index 1996 Change in coverage, classification and base year No -
2005 Change in concept, coverage, classification and methodology Yes In 2005, 2003-2004 period has been revised.
2014 Change in coverage and classification Yes In 2014, 2003-2013 period has been revised.
Economic Confidence Index 2017 Change in source data Yes In 2017, 2007-2016 period has been revised.
Note: As consumer confidence sub indices, the source data of the index, have been backcasted using a multivariable model approach for 2004-2011 period,analysis period has been lengthened and revision has been carried out in January 2017.
2017 Change in source data Yes In 2017, 2007-2017 period has been revised.
Note: Because of the change in the weight methodology of real sector confidence index, January 2007-March 2017 period has been revised in April 2017.
Education Expenditure Statistics 2015 Change in coverage and data source Yes In 2016, 2011-2014 period has been revised.
2017 Change in data source Yes In 2018, 2011-2016 period has been revised.
Environmental Employment, Revenue and Expenditure Statistics
Environmental Protection Expenditure Statistics
2013 Change in coverage Yes In 2015, 2012 has been revised.
Financial Intermediary Institution Statistics 2002 Change in methodology and classification No -
2009 Change in classification Yes In 2009, 2002-2008 period has been revised.
Foreign Trade Indices 2005 Change in base year Yes In 2005, 2003-2004 period has been revised.
2013 Change in base year Yes In 2013, time series of main sectors have been revised backwards until 1982.
(The revisions were implemented to link indexes with different base years and to retrieve a longer time series)
Gross Domestic Product by Expenditure Approach 2008 Change in base year and methodology Yes In 2008, 1998-2007 period has been revised.
2016 Change in base year and methodology Yes In 2016, 1998-2016 period has been revised.
Note: Because of the transition from ESA-95 to ESA-2010, using new sub-accounts based on 2012 Supply-Use and Input-Output Tables in calculation, integration of new administrative records and survey results into the accounting system 2009 based chain linked GDP volume indices have been started to be produced.
Gross Domestic Product by Income Approach 2007 Methodological change Yes In 2016, 1998-2006 period has been revised.
Note: Because of the updates in quarterly accounting by the addition of administrative records from Revenue Administration and Social Security Institution, GDP by income method has been revised.
Gross Domestic Product by Production Approach 2008 Change in base year and methodology Yes In 2008, 1998-2007 period has been revised.
2014 Change in classification Yes In 2014, 1998-2013 period has been revised.
2016 Change in base year and methodology Yes In 2016, 1998-2016 period has been revised.
Note: Because of the transition from ESA-95 to ESA-2010, using new sub-accounts based on 2012 Supply-Use and Input-Output Tables in calculation, integration of new administrative records and survey results into the accounting system 2009 based chain linked GDP volume indices have been started to be produced.
House Sales Statistics 2013 Change in coverage Yes In 2013, 2008-2012 period has been revised.
Household Labour Force Statistics 1992 Change in population projections Yes 1988-1992 period has been revised.
1997 Change in population projections Yes 1988-1997 period has been revised.
2000 Change in coverage, implementation period and classification No -
2001 Change in classification No -
2002 Change in population projections Yes 1988-2002 period has been revised.
2004 Change in estimation level No -
2005 Change in publication period No -
2008 Change in population projections Yes 2006-2007 period has been revised.
2009 Change in classification and population projections Yes 2004-2008 period has been revised.
2012 Change in classification No ISCO-88 - ISCO 08 correspondence table has been provided.
2014 Change in methodology, population projections and administrative division Yes 2005-2014 (January) period has been revised.
Industrial Labor Input Indices 2010 Change in classification Yes In 2010, 2005-2009 period has been revised.
2013 Change in base year Yes In 2013, 2005-2012 period has been revised.
Industrial Production Index 1994 Change in base year Yes In 1994, 1992-1993 period has been revised.
1999 Change in base year and classification Yes In 1999, 1977-1996 period has been revised.
2008 Change in base year and classification Yes In 2008, 2005-2008 period has been revised.
2010 Change in classification Yes In 2010, 2005-2009 period has been revised.
2013 Change in base year Yes In 2013, 2005-2012 period has been revised.
2018 Change in base year, classification, coverage, methodology, implementation, questionnaire structure and data source Yes In 2018, 2005-2017 period has been revised.
Industrial Turnover Index 2010 Change in classification Yes In 2010, 2005-2009 period has been revised.
2013 Change in base year Yes In 2013, 2005-2012 period has been revised.
Information and Communication Technology (ICT) Usage Survey on Households and Individuals 2009 Change in population data Yes In 2009, 2007-2008 period has been revised.
Labour Cost Index 2013 Change in base year Yes In 2013, 2007-2012 period has been revised.
2014 Methodological change Yes In the first and third quarter of 2014 2010-2013 period has been revised twice.
2015 Methodological change Yes In Q3 2015, Q1 2007 - Q2 2014 period has been revised.
2015 Methodological change Yes In Q1 2015, Q1 2007 - Q3 2014 period has been revised.
Life Tables 2015 Methodological change Yes In 2015, 2013 has been revised.
Marriage Statistics 2003 Change in source data Yes In 2006, 2001-2002 period has been revised.
Note: In 2006, from 2003 onwards marriage and divorce statistics have been started to be compiled and published from MERNIS database.
Population Projections and Related Demographic Indicators 1994 Methodological change Yes In 1994, 1990-2005 period has been revised.
2000 Change in projection assumptions Yes In 2001, 1990-2030 period has been revised.
2003 Change in projection assumptions Yes In 2005, 1990-2020 period has been revised.
2008 Change in base year and projection assumptions Yes In 2009, 1985-2025 period has been revised.
2010 Change in projection assumptions Yes In 2011, 2000-2025 period has been revised.
2012 Change in base year and projection assumptions Yes In 2013, 2000-2075 period has been revised.
Prices Received by Farmers (PRF /Index)
Prices and Production Values of Crop Products
Prices of Livestock and Production Values
Producer Price Index of Agricultural Products
2003 Change in base year and classification No -
2006 Methodological change No -
2014 Change in base year and methodology Yes In 2014, the series has been linked backwards until Wholesale Price Index of base year 1983=100.
2018 Change in base year Yes In 2018, 2010-2017 period has been revised.
Radio and Television Institution Statistics 2002 Change in methodology and classification No -
2009 Change in classification Yes In 2009, 2002-2008 period has been revised.
Regional Gross Domestic Product 2012 Methodological change Yes In 2016, the accounting process has been updated with the addition of data from Revenue Administration and Social Security Institution and GDP by provinces has been computed. Statistical Regions Level 2 GVA for 2004-2011 period has been revised.
Retail Sales Indices 2018 Change in base year, classification, coverage, methodology, implementation, questionnaire structure and data source Yes In 2018, 2005-2017 period has been revised.
Social Protection Statistics 2015 Change in data at data source Yes In 2016, 2003 - 2014 has been revised.
The Rates of Real Profits Created by Means of Financial Investment 2015 Change in source data Yes In 2015, from Jan 2005 to June 2015 has been revised.
Trade and Services Indices 2010 Change in classification Yes In 2010, 2005-2009 period has been revised.
2013 Change in base year Yes In 2013, 2005-2012 period has been revised.
 

Table 2. Statistics where there are breakings but no major revisions

Products Breakings in the Last 29 Years
Years of The Breaking Reasons for The Breaking
Agricultural Holdings Labour Wage Structure 2007 Methodological change
Death Statistics / Suicide Statistics 2009 Change in coverage and source
2012 Change in coverage and source
Entrepreneurship 2009 Sınıflama değişimi
Foreign Controlled Enterprise Statistics 2009 Change in classification
Higher Education Research & Development Statistics 2008 Methodological change
Household Consumption Expenditures
Household Consumption Expenditures (Regional)
2002 Change in classification
2007 Change in population projections
Income and Living Conditions Survey
Income and Living Conditions Survey (Regional)
2010 Change in classification
2012 Change in classification
Industry/Service Institutions Research & Development Statistics 2001 Change in classification
2009 Change in classification
Innovation Survey 2011 Change in classification
Juveniles Received into Security Unit 2007 Change in coverage
Manufacturing Industry Establishments Water Wastewater and Waste Statistics 2004 Change in coverage
2008 Change in coverage
Mining Establishments Water, Wastewater and Waste Statistics 2010 Change in coverage
2012 Change in coverage
Poverty Study 2010 Methodological change
Public Institutions Research & Development Statistics 2008 Change in classification
Regional Gross Domestic Product / Value Added
Gross Domestic Product by Provinces
Not available for 2002-2003 No data continuity
Road Motor Vehicles 2004 Methodological change
Road Traffic Accident Statistics 2015 Change in coverage
The Rates of Real Profits Created by Means of Financial Investment 2002 Change in currency unit
Turkey Concentration in Manufacturing Industry
Concentration in Industry and Service Sector
1997 Change in classification
2006 Change in classification
2009 Change in classification
Use of Information and Communication Technology (ICT) by Enterprises 2010 Change in classification

 

Table 3. Statistics where there are no breakings or major revisions

 

Products Products
Agricultural Holdings Structure Survey Municipal Waste Statistics
Animal Production Statistics Municipal Wastewater Statistics
Annual Gross Domestic Product Municipal Water Statistics
Birth Statistics Non-Domestic Producer Price Index
Causes of Death Statistics Non-formal Education Activities Survey
Cinema and Theatre Statistics Operas, Ballets, Orchestras, Choirs and Groups
Construction Cost Index Organized Industrial Zones Water, Wastewater and Waste Statistics
Consumer Price Index Poultry Production
Continuing Vocational Training in Enterprises Print Media Statistics
Crop production 1st Estimation, 2nd Estimation and Statistics Prison Statistics
Crop Products Balance Sheets Reconciliation Between Work and Family Life
Cultural Economy Red Meat Production
Cultural Employment Regional Purchasing Power Parity
Cultural Heritage Research and Development Activities Survey
Election Statistics Rest of The World Accounts
Electricity and Natural Gas Prices Sectoral Confidence Indices
External Trade Statistics by Enterprise Characteristics Sectoral Energy Consumption Statistics
Family Structure Survey Sectoral Water and Wastewater Statistics
Fishery Products Small and Medium Sized Enterprises Statistics
Foreign Trade Statistics Solid Fuels
Government Accounts State Supported Agricultural Insurance
Greenhouse Gas Emissions Statistics Structure of Earnings Survey
Health Expenditure Statistics Sustainable Development Indicators
Household Domestic Tourism Statistics The Results of Address Based Population Registration System
Institutional Sector Accounts The Supply-Use and Input-Output Tables Of The Turkish Economy
International Migration Statistics Thermal Power Plants Water, Wastewater and Waste Statistics
International Standart Book Number (ISBN) Statistics Turkey Health Survey
Labor Input Indices Turnover Indices
Labour Cost Survey Vehicle-kilometer Statistics
Library Statistics Waste Disposal and Recovery Facilities Statistics
Life Satisfaction Survey Waste Statistics of Health Institutions/Medical Waste Statistics
Milk and Milk Products