1. SASU manual: sampling issues
Task Force sub-group 6
Task Force on Victimization
Eurostat
14-15 February 2012
SASU manual:
sampling issues

2. TF sub-group 6: sampling issues
Sample Selection
Precision Requirements
Precision Requirements in SASU by Martins Liberts
Sample Weighting
Construction of sample weights for the
EU Safety Survey (EU-SASU) by Guillaume Osier

3. Sample Selection Target population
Persons 16+ living in private households
No collective households or institutions
No homeless persons
Exceptions for small parts of the national territory (Annex II)

4. Sample Selection Sampling design
Sampling frame, e.g.
National population register
RDD
Master sample
Sampling design
(regulation: nationally representative probability sample) e.g.
Simple random sampling
Stratified sampling
Multi-stage sampling
Systematic random sampling

5. Sample Selection Survey units for sampling
Sample of persons or households
Only one person per household
Survey units for data collection
Selected person
Administrative sources for technical variables and information on socio-demographic background only
Survey units for analysis
Persons (crimes affecting the person)
Households (crimes affecting the household)

6. Sample Selection Questions to the TF
Target Population: Reference date?
Overlaps or inconsistency between sub-groups:
sub-group 5: 2. Age limits
Frames/designs not mentioned in the paper

7. Precision Requirements in SASU
by Martins Liberts
Precision Requirements in the Regulation
defined by the effective sample size
expressed as number of persons
set for the estimates of main indicators
 prevalence rates of crimes affecting the person and of crimes affecting the household

8. Precision Requirements in SASU
Design Effect
Deff1: effect of sampling design
(stratification effect, clusterization effect)
Deff2: effect of estimator
Deff3: effect of non-sampling errors
(non-response, over-coverage)

9. Precision Requirements in SASU
The Estimation of the Initial Sample Size
maximum design effect selected from the estimates of the indicators
The Evaluation of the Precision
two options:
- by computing the achieved effective sample size
- by computing the variance of the indicator of interest (proportion of persons or households)

10. Precision Requirements
Questions to the TF
Manual: what should be covered by the manual?
what is useful and important for the countries?
Further considerations regarding the Quality Report:
- Main indicators: which one?
how to calculate prevalence rates?
- Quality: what is acceptable?
rules for publications?

11. Task Force sub-group 6 SASU manual: sampling issues
Thank you for your attention
Please address queries to:
Barbara Bauer
Martins Liberts
Petr Nosal
Guillaume Osier