TwinLife Documentation TwinLife Documentation TwinLife Documentation
  • Overview and getting started
    • Overview (Table of content)
    • Getting started
    • Data access & documentation
  • 1. About TwinLife
    • 1.1 Basic Concept
    • 1.2 Study Design and Sample Structure
    • 1.3 Where and how to get the Data
  • 2. Documentation of the study
    • 2.1 Data Documentation Website and ShortGuide
    • 2.2 Documentation within the Data Sets
    • 2.3 paneldata.org
    • 2.4 Codebooks
    • 2.5 Technical Report Series, Methodology Reports, and Working Paper Series
  • 3. Data Structure
    • 3.1 Data Formats and Data Files
    • 3.2 Person Types
    • 3.3 System of Variable Names
    • 3.4 ID Variables, Wave and Data Collection Identifiers
    • 3.5 Missing Types and their Meanings
    • 3.6 Delivered Para Data
    • 3.7 Weights
    • 3.8 Pecularities of Data
    • 3.9 How to match the Data Files
    • 3.10 Matching information from the parent-about-child questionnaire to the child's data set
  • 4. Check Routines
    • 4.1 Check routines
    • 4.2 Data Adjustment
  • 5. Generated Variables and Scales
    • 5.1 Generated Variables
    • 5.2 Generated Scales
  • 6. Publications and Citation
    • 6.1 Publications and Literature Database
    • 6.2 Citation
  • 7. Useful Links
  • Terms and Privacy
  • Downloads
  • Overview and getting started
    • Overview (Table of content)
    • Getting started
    • Data access & documentation
  • 1. About TwinLife
    • 1.1 Basic Concept
    • 1.2 Study Design and Sample Structure
    • 1.3 Where and how to get the Data
  • 2. Documentation of the study
    • 2.1 Data Documentation Website and ShortGuide
    • 2.2 Documentation within the Data Sets
    • 2.3 paneldata.org
    • 2.4 Codebooks
    • 2.5 Technical Report Series, Methodology Reports, and Working Paper Series
  • 3. Data Structure
    • 3.1 Data Formats and Data Files
    • 3.2 Person Types
    • 3.3 System of Variable Names
    • 3.4 ID Variables, Wave and Data Collection Identifiers
    • 3.5 Missing Types and their Meanings
    • 3.6 Delivered Para Data
    • 3.7 Weights
    • 3.8 Pecularities of Data
    • 3.9 How to match the Data Files
    • 3.10 Matching information from the parent-about-child questionnaire to the child's data set
  • 4. Check Routines
    • 4.1 Check routines
    • 4.2 Data Adjustment
  • 5. Generated Variables and Scales
    • 5.1 Generated Variables
    • 5.2 Generated Scales
  • 6. Publications and Citation
    • 6.1 Publications and Literature Database
    • 6.2 Citation
  • 7. Useful Links

4.1 Check routines

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  • The following types of checks are carried out by the TwinLife team or the survey institute (detailed information about the procedures will be provided in a Technical Report):

    1. Longitudinal consistency
        • variable pid, sex identical to prior waves
        • body height and weight
        • variable coding longitudinally consistent

    2. Identity checks
        • match of sex, first name, date of birth, relationship to twins between preload and survey
        • checks for duplicates (persons included several times in the sample?)
        • change of surveyed sibling identified and corrected
        • household composition

    3. Logical relations
        • age of twins vs. cohort
        • age vs. ptyp
        • age and sex of (biological) parents
        • twins’ age and sex identical
        • body height and weight

    4. Completeness
        • Starting sample vs. realized sample (on personal, household, and family level)
        • Instrument/questionnaires vs. delivered variables

    5. Instrument
        • Completeness and correctness of preload variables and generated filter variables
        • filter conditions

    6. Variables
        • correctness of variable labels and value labels
        • correctness of missing values
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