ICVS IN SLOVENIAICVS IN SLOVENIA

Tatjana ŠkrbecTatjana Škrbec

Content of presentationContent of presentation

Short historyShort history Crime victim survey 2001 within SORSCrime victim survey 2001 within SORS

Methodology and content of questionnaireMethodology and content of questionnaire Organisation of surveyOrganisation of survey Sampling method, weighting, precision of estimatesSampling method, weighting, precision of estimates DisseminationDissemination Main conclusions after ICVS 2001; plans for futureMain conclusions after ICVS 2001; plans for future

Advantages and disadvantages of carrying out Advantages and disadvantages of carrying out ICVS within statistical office-sICVS within statistical office-s

ConclusionsConclusions

SHORT HISTORYSHORT HISTORY

ICVS was carried out three times ICVS was carried out three times inSloveniainSlovenia Within Institute of Criminology at the Within Institute of Criminology at the

Faculty of Law:Faculty of Law:In 1992 (net sample size: 1000 households)In 1992 (net sample size: 1000 households)In 1997 (net sample size: 2053 households; In 1997 (net sample size: 2053 households;

1033 for Ljubljana; 1020 for other parts of 1033 for Ljubljana; 1020 for other parts of Slovenia Slovenia

Within SORS:Within SORS:In 2001 included in National programe of In 2001 included in National programe of

statistical surveysstatistical surveys

CVS 2001 WITHIN SORSCVS 2001 WITHIN SORSMETHODOLOGY AND CONTENT OF METHODOLOGY AND CONTENT OF

QUESTIONNAIREQUESTIONNAIRE

In line with ICVS questionnaire and methodology In line with ICVS questionnaire and methodology and with standard rules for carrying out and with standard rules for carrying out household sample surveyshousehold sample surveys

Only minor changes were implemented in Only minor changes were implemented in Slovene version of questionnaireSlovene version of questionnaire The questions about the opinion on possibility to prevent The questions about the opinion on possibility to prevent

crime were addedcrime were added The questions about corruption were keptThe questions about corruption were kept The order of some questions was changedThe order of some questions was changed The possible answers within the block of demographic The possible answers within the block of demographic

questions were harmonised with other surveys – but still questions were harmonised with other surveys – but still in line with ICVS demandsin line with ICVS demands

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSORGANISATION OF THE SURVEYORGANISATION OF THE SURVEY

Preparatory work during year 2000 and Preparatory work during year 2000 and beginning of year 2001beginning of year 2001Team of people involved in ICVS within SORS Team of people involved in ICVS within SORS

was appointedwas appointedMethodological and technical instructions for Methodological and technical instructions for

interweavers were preparedinterweavers were prepared18 interweavers (yust female) were chosen 18 interweavers (yust female) were chosen

and trainedand trainedSample for pilot and main survey was preparedSample for pilot and main survey was preparedInstructions and programmes for processing Instructions and programmes for processing

and tabulations of data were prepared and tabulations of data were prepared

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSORGANISATION OF THE SURVEYORGANISATION OF THE SURVEY

Pilot survey in November 2000Pilot survey in November 2000300 telephone 300 telephone

numbers/households were chosen numbers/households were chosen in the samplein the sample

Two versions of questionnaire Two versions of questionnaire were testedwere tested

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSORGANISATION OF THE SURVEYORGANISATION OF THE SURVEY

Main survey – from 22 January until 22 MarchMain survey – from 22 January until 22 March

Advance letter, together with presentation of the survey Advance letter, together with presentation of the survey was sent to the chosen householdswas sent to the chosen households

Method used for the survey was computer assisted Method used for the survey was computer assisted telephone intervewing (CATI)telephone intervewing (CATI)

Respondents, older than 16 years was selected within Respondents, older than 16 years was selected within household members according to the “last birthday” household members according to the “last birthday” methodmethod

Gross sample size for the survey was 6000 thelephone Gross sample size for the survey was 6000 thelephone numbers/households (responce rate at the and was numbers/households (responce rate at the and was 66,8%)66,8%)

Documentation was finished after the end of the Documentation was finished after the end of the survey for all phases of work survey for all phases of work

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSSAMPLING METHODSAMPLING METHOD

Sample frame – directory of private telephone Sample frame – directory of private telephone subscriberssubscribers

The sample was stratified, systematic and The sample was stratified, systematic and randomrandom

Strata were defined with statistical regions (12 regions) Strata were defined with statistical regions (12 regions) and type of settlement within the region (6 types) – in and type of settlement within the region (6 types) – in each stratum we sampled independentlyeach stratum we sampled independently

The number of units in each stratum was proportional to The number of units in each stratum was proportional to the share of people aged 16 years or more living in the share of people aged 16 years or more living in certain type of settlement in certain regioncertain type of settlement in certain region

The city of Ljubljana was over sampled to ensure The city of Ljubljana was over sampled to ensure comparability with the data from 1992 and 1997comparability with the data from 1992 and 1997

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSWEIGHTING OF THE SURVEY DATAWEIGHTING OF THE SURVEY DATA

Basic weightingBasic weighting according to the household size was doneaccording to the household size was done

Additional weighting (calibration)Additional weighting (calibration) was used for adjustment of the control was used for adjustment of the control

variables (sex, age, level of education, variables (sex, age, level of education, household size, statistical region and type household size, statistical region and type of settlement)to the known population of settlement)to the known population structurestructure

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSPRECISION OF ESTIMATES – INFORMATION PRECISION OF ESTIMATES – INFORMATION

FOR DATA USERSFOR DATA USERS For some target variables – with the Sudaan 7.0 For some target variables – with the Sudaan 7.0

softweresoftwere For other published data – with the help of the For other published data – with the help of the

modelmodel

Error criteriaError criteria Estimates with the coefficient of variation under 0,10 Estimates with the coefficient of variation under 0,10

were published without limitationswere published without limitations Estimates with the coefficient of variation between 0,10 Estimates with the coefficient of variation between 0,10

and 0,15 were published in single parenthesesand 0,15 were published in single parentheses Estimates with the coefficient of variation between 0,15 Estimates with the coefficient of variation between 0,15

and 0,30 were published in double parenthesesand 0,30 were published in double parentheses Estimates with the coefficient of variation over 0,30 Estimates with the coefficient of variation over 0,30

were not published, but each one is substituted by a dotwere not published, but each one is substituted by a dot

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSDISSEMINATION OF DATADISSEMINATION OF DATA

The results of the survey were presented:The results of the survey were presented:

In bi-lingual (Slovenene-English) publications of In bi-lingual (Slovenene-English) publications of SORSSORS Rapid reports (September 2001)Rapid reports (September 2001) Results of surveys – together with the data from criminal Results of surveys – together with the data from criminal

justice statistics (March 2002)justice statistics (March 2002) At the press conferenceAt the press conference (september 2001) (september 2001) Deindividualised micro data were transsmited to Deindividualised micro data were transsmited to

the Archive of sociological datathe Archive of sociological data (fre acces for (fre acces for researchers, students)researchers, students)

Micro data were also sent to UnicriMicro data were also sent to Unicri (October (October 2001)2001)

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSMAIN CONCLUSIONSMAIN CONCLUSIONS

The sample size was too small to allow The sample size was too small to allow more in-depth analysis of data at a more in-depth analysis of data at a sufficient level of reliability;sufficient level of reliability;

Computer assisted telephone interviewing Computer assisted telephone interviewing was provenas a good method for this type was provenas a good method for this type of survey – this is an advantage because it of survey – this is an advantage because it is also the chiepest method;is also the chiepest method;

ICVS 2001 WITHIN SORSICVS 2001 WITHIN SORSPLANS FOR FUTUREPLANS FOR FUTURE

Preparatory work for nw CVS is Preparatory work for nw CVS is planned to start in the year 2005planned to start in the year 2005

Sample size will be extendedSample size will be extended

ADVANTAGES AND DISADVANTAGES OF ADVANTAGES AND DISADVANTAGES OF CARRYING OUT ICVS WITHIN CARRYING OUT ICVS WITHIN

STATISTICAL OFFICE/SSTATISTICAL OFFICE/S

Advantages:Advantages:

Regular financial sourcesRegular financial sources Technology and know-how already avalilable Technology and know-how already avalilable Standard rules for accepted for carrying out Standard rules for accepted for carrying out

household sample surveys must be followedhousehold sample surveys must be followed (sufficient sample size; sampling, weighting (sufficient sample size; sampling, weighting

methods, information about quality of data, methods, information about quality of data, documentation) documentation)

ADVANTAGES AND DISADVANTAGES OF ADVANTAGES AND DISADVANTAGES OF CARRYING OUT ICVS WITHIN CARRYING OUT ICVS WITHIN

STATISTICAL OFFICE/SSTATISTICAL OFFICE/S

Disadvantages:Disadvantages:

Big organisation system – planning and Big organisation system – planning and preparatory work must start months preparatory work must start months before the field work starts;before the field work starts;

Limited resources – the priority of crime Limited resources – the priority of crime statistics in comparison with some other statistics in comparison with some other fields of statistics is rather low; fields of statistics is rather low;

CONCLUSIONSCONCLUSIONS

Internationaly harmonised Internationaly harmonised household/population crime wictims household/population crime wictims surveys – easiest method for reaching surveys – easiest method for reaching international comparability of data in the international comparability of data in the field of crime statistics;field of crime statistics;

Priorities on the field of crime statistics Priorities on the field of crime statistics within national Statistical Office/s in line within national Statistical Office/s in line with future priorities of EU – Eurostat in with future priorities of EU – Eurostat in this field of statistics; this field of statistics;