1. Implementation of quality indicators in STS
Quality WG, 6 December 2016

2. Objective
To monitor through a limited set of quality indicators a few key data quality aspects of STS time series complementing the existing data compliance assessments.

3. e-TF set up To work out 3-5 indicators to be prioritised
To provide additional guidance on the calculation
To discuss principles and timetable for implementation

4. Criteria for the quality indicators
Relevance for the STS PEEIs
Feasibility to be produced on a regular basis at both national and EU level
Meaningfulness for both producers and users

5. Prioritised quality indicators
The same revision policy applied to STS data released nationally and transmitted to Eurostat
Mean Absolute Revision (MAR)
Mean Revision (MR)
Coefficient of variation
Data availability for first results => Unit non- response rate for first releases

6. The same revision policy…
A qualitative indicator
To ensure coherence in disseminated national data and European data
Precondition: a revision policy in place
The revision policy needs to be described
"ESS guidelines on revision policy for PEEIs"
Part of the STS metadata enrichment in 2015

7. MAR and MR For all STS PEEIs (except Prices)
Growth rates for original data series (YoY)
Growth rates for calendar/ working day adjusted (YoY)
Breakdown: only TOTALs
Reference periods: 20 values for quarterly data and 36 for monthly data
"Latest value" in the year T ESMS reports: Dec or Q4 year T.
Eurostat proposal: to provide also the MaxAR

8. MAR and MR

9. Coefficient of variation
Only for Retail Trade when possible (if probability sampling used)
To be provided for estimates of turnover
Activity breakdown: only TOTALs
Temporal breakdown: twelve monthly CV in the reference year T ESMS report
Part of the STS metadata enrichment in 2016

10. Unit non-response for first releases
Proposal: to replace data availability for first estimates
For all STS PEEIs (except Prices)
Size weighted unit non-response rate
Non-response = no information or not usable information
Weighting variable: turnover or other variable(s) known for the whole population
Breakdown: only TOTALs
Reference period: Q2 for quarterly data and June for monthly data in the reference year T ESMS report.

11. Implementation of the QI's - principles
The STS ESMS files should be the source
To be included in the ESMS files for year T updated in April year T+1
The additional guidelines to be included in the Vademecum on STS National Reference Metadata
MS's responsible for providing QI's for their national data sent to Eurostat and Eurostat responsible for providing QI's for the European aggregates
The annual quality monitoring should be presented to the STS WG

12. Implementation of the QI's - timetable
Metadata reporting year
Metadata
Type
STS quality indicators
2017
Descriptive
The same revision policy applied to STS data released nationally and transmitted to Eurostat.
2018
Quantitative
Coefficient of variation (if applicable)
MAR and MR for the STS PEEIs on Construction.
MAR and MR for the STS PEEIs on Industry.
2020
Unit non-response for first releases
2020+
MAR and RMAR for the STS PEEIs on Retail Trade and Services.

13. Conclusions
The STS WG Nov approved the set of prioritised quality indicators (with MaxAR only to be included as a complementary indicator if considered useful).
The STS WG Nov agreed to the proposed timetable and principles for the implementation of the STS quality indicators.