UK Data Archive Study Number 7543 - Scottish Crime and Justice Survey, 2012-2013 Scottish Crime and Justice Survey 2012/13: Technical Report Michael Davidson, Neil Grant - Scottish Government Leon Page - TNS-BMRB Edinburgh, March 2014 SCJS 2012/13 Methodology Report CONTENTS 1 Background ................................................................................................ 1 1.1 Introduction to the Scottish Crime and Justice Survey ......................... 1 1.2 Outputs from the SCJS 2012/13 ............................................................... 5 1.3 Structure of the Technical Report ............................................................. 5 2 Sample Design and Selection .................................................................. 7 2.1 Requirements ............................................................................................... 7 2.2 Sample Design and Assumptions ............................................................. 7 2.3 Sample Selection ........................................................................................ 9 2.3.1 Selecting households at addresses with multiple dwellings ....... 10 2.3.2 Selecting individuals within households ........................................ 10 2.3.3 Allocation of sample to different time periods ............................... 11 3 Survey Response ..................................................................................... 12 3.1 Introduction ................................................................................................. 12 3.2 Scotland level summary ........................................................................... 12 3.3 Police Force Area performance .............................................................. 14 3.4 Self-completion performance .................................................................. 14 4 Survey Weighting ..................................................................................... 16 4.1 Introduction ................................................................................................. 16 4.2 Main household weight ............................................................................. 16 4.2.1 Dwelling unit selection weight ......................................................... 16 4.2.2 Household calibration ....................................................................... 17 4.3 Main adult weight ...................................................................................... 18 4.3.1 Individual pre-weight ......................................................................... 18 4.3.2 Individual calibration ......................................................................... 18 4.4 Self-Completion Weights ......................................................................... 19 i Contents 4.5 Victim form weight (incidence weight) ................................................... 19 4.6 Summary of weights ................................................................................. 20 4.6.1 Weighting and expansion variables in SPSS data files .............. 22 4.6.2 Calculating rates per 10,000 statistics ........................................... 23 5 Questionnaire Content ............................................................................ 24 5.1 Structure and coverage of the questionnaire ........................................ 24 5.1.1 Changes to the questionnaire from 2010/11 ................................. 27 5.1.2 Questionnaire piloting ....................................................................... 28 5.2 Main questionnaire content...................................................................... 29 5.2.1 Perceptions of crime (section 1) ..................................................... 29 5.2.2 Victim form screener (section 2) ..................................................... 29 5.3 Victim form questionnaire structure ........................................................ 31 5.3.1 Identification and ordering of incidents for victim forms .............. 31 5.3.2 Series of incidents ............................................................................. 32 5.4 Victim form questionnaire contents (section 3) .................................... 34 5.4.1 Incident dates ..................................................................................... 34 5.4.2 Incident details ................................................................................... 35 5.4.3 Victim’s experience of the criminal justice system and related issues 36 5.4.4 Incident summary .............................................................................. 37 5.5 Full sample modules (section 4) (main questionnaire content continued) ............................................................................................................... 37 5.5.1 Justice system (section 4.1)) ........................................................... 37 5.5.2 Police (section 4.2)............................................................................ 38 5.5.3 Convicted of crime (section 4.3) ..................................................... 38 5.6 Quarter-sample modules (A-D) (section 5) ........................................... 38 5.6.1 Module A: local community (section 5.1) ....................................... 38 ii SCJS 2012/13 Methodology Report 5.6.2 Module A: perception of crime (section 5.2) ................................. 39 5.6.3 Module B: sentencing (section 5.3) ................................................ 39 5.6.4 Module C & D: civil law (section 5.4) ............................................. 39 5.6.5 Module C & D: harassment.............................................................. 40 5.6.6 Demographics section (section 6) .................................................. 41 5.7 Self-completion questionnaire content ................................................... 42 5.7.1 Risk factors (section 7) ..................................................................... 42 5.7.2 Illicit drug use (section 8) ................................................................. 43 5.7.3 Stalking and harassment and partner abuse (section 9) ............ 44 5.7.4 Sexual victimisation (section 10) .................................................... 45 6 Fieldwork ................................................................................................... 48 6.1 Briefing of interviewers ............................................................................. 48 6.2 Supervision and quality control ............................................................... 49 6.3 Fieldwork dates and fieldwork management ........................................ 49 6.4 Fieldwork procedures and documents ................................................... 50 6.4.1 Advance letter and leaflet ................................................................ 50 6.4.2 Address contact record .................................................................... 51 6.5 Response rate and reasons for non-response ..................................... 51 6.6 Self-completion response rate and reasons for non-completion ....... 52 6.6.1 Response rate and respondent profiles ......................................... 53 6.6.2 Reasons for non-completion ........................................................... 53 7 The Interview ............................................................................................. 54 7.1 Survey reference period ........................................................................... 54 7.1.1 Series incidents and the reference period ..................................... 55 7.2 Numbers of victim forms completed ....................................................... 56 7.3 Computer Assisted Personal Interviewing ............................................ 57 iii Contents 7.3.1 Plausibility and consistency checks ............................................... 57 7.3.2 Text substitution and date calculations .......................................... 58 7.3.3 Don’t know and refused codes ........................................................ 58 7.4 Use of show cards and show screens ................................................... 58 7.5 Length of interview .................................................................................... 59 7.6 Presence of others during the interview ................................................ 60 7.7 Self-completion interview ......................................................................... 61 8 Data Processing ....................................................................................... 62 8.1 Offence coding process ........................................................................... 62 8.1.1 Scottish Government offence coding validation ........................... 63 8.1.2 Offence code history ......................................................................... 64 8.1.3 Standard and open-end coding ....................................................... 65 8.2 Coding of occupation and socio-economic classification ................... 65 8.3 Data checking ............................................................................................ 66 9 Offence Codes, Survey Statistics and Crime Groups ......................... 67 9.1 Crime types / offence codes covered by the survey ............................ 67 9.1.1 Offence codes .................................................................................... 67 9.1.2 A note on crime types