1. LAMAS Working Group 5-6 October 2016
Agenda Item 4.3 JVS methodology and revision policies

2. Questionnaire on JVS methodology
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!