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JVS Methodology and Revision Policies - Overview and Questionnaires

This document provides an overview of the JVS methodology and revision policies, including information on the coefficient of variation, sample size, and response rates. It also includes the results of questionnaires on JVS methodology and back series and revision policies.

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JVS Methodology and Revision Policies - Overview and Questionnaires

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  1. LAMAS Working Group 5-6 October 2016 Agenda Item 4.3 JVS methodology and revision policies Piotr.Ronkowski@ec.europa.eu

  2. Overview • Questionnaire on JVS methodology • Questionnaire on back series and revision policies

  3. Questionnaire on JVS methodology • Eurostat compiled metadata information for the JVS Report to the EP and the Council • The coefficient of variation, sample size, the response rates of the JVS surveys for the reference quarters in 2014 included • Information gathered from the JVS quality reports and replies of the NSIs to the questionnaire

  4. Coefficient of variation • Available for all Member States except UK and EL • CZ and LU derive JVS data from administrative sources • CV below 10% for all the quarters in 2014, except for: BG, CY, FI, FR, as well as BE, ES (both over 10% only for 2014Q1), IE (over 10% for 2014Q4) and LV (over 10% for 2014Q1 and 2014Q4)

  5. Sample size • - Varied from around 1 300 units surveyed in MT and 3 000 in CY to around 75 000 in DE (in the larger survey conducted every fourth quarter) and 100 000 in PL • - Clear negative relationship between the sample size and the coefficient of variation

  6. Coefficient of variation as a function of the sample size (1/√n)

  7. Response rate • Above 50% in all cases except DE (17% for the survey conducted in the fourth quarter) and HR (42%) • The highest rate in Romania: 99%

  8. Questionnaire on back series and revision policies • LAMAS in January 2016 took note of Eurostat's request for receiving full time series each quarter • Agreed that NSIs would be surveyed on this proposal as well as on their data revision policies • As of 24 June 2016, all EU Member States, except HR, EL and NL had replied to the questionnaire

  9. Back series • Countries asked to transmit each quarter NSA and SA data back to reference quarter 2010Q1 at least • This is not yet the case for: CZ, FI, EL, IE, NL, SE and NO

  10. Revision policies • Revision policies in place for: BE, BG, DK, DE, IE, ES, FR, IT, LV, LT, HU, NL, RO, SI, FI, UK and CH • CY and HU consider introducing a revision policy in the future

  11. Revision policies • 5 countries revise raw JVS data with a quarterly frequency whereas 4 have an annual revision policy • 16 countries revise SA data with a quarterly frequency whereas 4 have an annual revision policy

  12. Revision policies • Member States are invited to adopt a common revision policy for SA data, as follows: - Seasonal factors to be revised every quarter, impacting the full series backwards - Seasonal adjustment models to be revised once per year only, for the transmission of reference quarter Q1 due in June

  13. LAMAS delegates are invited: • - To take note of the results of the questionnaire on JVS methodology • - As regards UK, EL and IE: to transmit the coefficient of variations for the total number of vacancies to Eurostat • - As regards LU and CZ: to provide information on the quality checks performed on the administrative data used for JVS purposes • - As regards countries with a coefficient of variation above 10% OR with a response rate below 50%: to comment on the accuracy of JVS data and on possible improvements in the future

  14. LAMAS delegates are invited: • - To take note of the results of the questionnaire on national revision policies for JVS • - As regards CZ, FI, EL, IE, NL, SE and NO: to consider sending full back series every quarter, back to 2010Q1 at least • - To take note of the proposal for harmonized revision policies in the field of seasonally adjusted data

  15. Thank you for your attention!

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