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Introduction to DDI with a Technical Perspective

         7th Workshop of German Panel Surveys

                              01.02.2013



                            Thomas Bosch
                               M.Sc. (TUM)
                               PhD student
                       boschthomas.blogspot.com
             GESIS - Leibniz Institute for the Social Sciences
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               2
Outline

   • PhysicalDataProduct
   • PhysicalInstance
   • DDIProfile



   • Colectica
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               4
General Information About Missy
• Missy (Microdata Information System)

•   Provides detailed information about individual datasets
•   Contains metadata of microdata relevant for the social sciences
•   Facilitates data usage for research
•   Currently consists of microcensus survey
    • Largest household survey in Europe
    • statistics about
        • general population in Germany
        • situation about employment market
          (occupation, professional education, income, legal insurance, …)

                                                                             5
General Information About Missy
• May be split in two parts
   • Missy Web (end-user front-end part)
   • Missy Editor for documentation (back-end part)


• Consists of approx. 500 Variables & Questions per year
• Captures 25 years, since 1973




                                                           6
Missy 3
• That’s what it’s all about! The “next generation Missy”

• Integration of further surveys, e.g. EU-SILC, EU-LFS, …
• Implementation of Missy Editor as a Web-Application




                                                            7
Use-Cases in Missy
•   General Information about survey 'microcensus'
•   Variables by thematic classification and year
•   List of variables by year
•   List of generated variables by year
•   Show details of a variable with statistics
•   Variable-Time Matrix
    • List of variables by thematic classification and year (selectable)
• Questionnaire Catalogue

• In future: browse by survey and country!                                 8
9
Use-Cases in Missy
•   General Information about survey 'microcensus'
•   Variables by thematic classification and year
•   List of variables by year
•   List of generated variables by year
•   Show details of a variable with statistics
•   Variable-Time Matrix
    • List of variables by thematic classification and year (selectable)
• Questionnaire Catalogue

• In future: browse by survey and country!                                 10
11
Use-Cases in Missy
•   General Information about survey 'microcensus'
•   Variables by thematic classification and year
•   List of variables by year
•   List of generated variables by year
•   Show details of a variable with statistics
•   Variable-Time Matrix
    • List of variables by thematic classification and year (selectable)
• Questionnaire Catalogue

• In future: browse by survey and country!                                 12
13
Use-Cases in Missy
•   General Information about survey 'microcensus'
•   Variables by thematic classification and year
•   List of variables by year
•   List of generated variables by year
•   Show details of a variable with statistics
•   Variable-Time Matrix
    • List of variables by thematic classification and year (selectable)
• Questionnaire Catalogue

• In future: browse by survey and country!                                 14
Use-Cases in Missy
•   General Information about survey 'microcensus'
•   Variables by thematic classification and year
•   List of variables by year
•   List of generated variables by year
•   Show details of a variable with statistics
•   Variable-Time Matrix
    • List of variables by thematic classification and year (selectable)
• Questionnaire Catalogue

• In future: browse by survey and country!                                 15
16
Use-Cases in Missy
•   General Information about survey 'microcensus'
•   Variables by thematic classification and year
•   List of variables by year
•   List of generated variables by year
•   Show details of a variable with statistics
•   Variable-Time Matrix
    • List of variables by thematic classification and year (selectable)
• Questionnaire Catalogue

• In future: browse by survey and country!                                 17
18
Use-Cases in Missy
•   General Information about survey 'microcensus'
•   Variables by thematic classification and year
•   List of variables by year
•   List of generated variables by year
•   Show details of a variable with statistics
•   Variable-Time Matrix
    • List of variables by thematic classification and year (selectable)
• Questionnaire Catalogue

• In future: browse by survey and country!                                 19
20
Flow Diagram




               21
UML Class Diagrams




                     22
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               23
24
25
Modules




          26
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               27
DDIInstance




              28
DDIInstance




              29
ResourcePackage




                  30
ResourcePackage




Allows packaging of any maintainable item as a resource item
 Structure to publish non-study-specific materials for reuse
                                                               31
ResourcePackage




Any module (except: StudyUnit, Group, LocalHoldingPackage)
                                                             32
ResourcePackage




                           Any Scheme (Banks)
Internal or external references to schemes and elements within schemes
                                                                         33
Group




        34
Group




Groups allow inheritance
                           35
Group




        36
Organization




               37
Organization




               38
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               39
Comparison (DDI 3.1)

1. ResourcePackage
2. Group
3. Comparison




                                   40
Comparison (MISSY)




                     41
42
Comparison (DDI 3.1)
1. ResourcePackage
2. Group
3. Comparison




                                   43
References to same contents of ResourcePackages

                                                  44
Comparison (DDI 3.1)
1. ResourcePackage
2. Group
3. Comparison




                                   45
Group (study and variable information)

                             --> variables in this group are comparable


                                      --> inherit
label = 'variable age'


                                                --> overwrite variable information
                             label = 'age'



                              + easy to understand

                                - Implementation
                         - changes --> reorganize groups
                                                                                     46
Comparison (DDI 3.1)
1. ResourcePackage
2. Group
3. Comparison




                                   47
Comparison




             48
Comparison
Comparison
  VariableMap
  CategoryMap
  CodeMap
  ConceptMap
  QuestionMap
  UniverseMap


   Why not more?  good understanding of these elements
                                                          49
Comparison (Example)

  Variable-Age       Variable-AgeGroup
codes/categories   codes         categories
      20            1              20 – 29
       …            …                …
      29            1              20 – 29
      30            2              30 – 39
       …            …                …
      67            6              60 – 67




                                              50
VariableMap

Variable-Age --> Variable-AgeGroup

     commonality, difference




                                     51
CodeMap
Variable-Age   Variable-AgeGroup
    20                1
     …                …
    29                1
    30                2
     …                …
    67                6




 commonality, difference
                                   52
CategoryMap
Variable-Age   Variable-AgeGroup
    20              20 – 29
     …                …
    29              20 – 29
    30              30 – 39
     …                …
    67              60 – 69




 commonality, difference
                                   53
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               54
StudyUnit




            55
Coverage




           56
Coverage




           57
TemporalCoverage




                   58
TopicalCoverage




                  59
SpatialCoverage




                  60
SpatialCoverage




                  61
TopicalCoverage




                  62
TemporalCoverage




                   63
Citation




           64
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               65
ConceptualComponent

ConceptualComponent




                      66
ConceptualComponent




                      67
ConceptScheme




                68
ConceptScheme




                69
Concept




          70
Thematic Classification (MISSY)




                                  71
Concept




          72
Universe




           73
Universe




           74
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               75
LogicalProduct




                 76
LogicalProduct




                 77
CodeScheme




             78
CodeScheme (MISSY)




                     79
CodeScheme




             80
Code




       81
Code (MISSY)




               82
Code




       83
CategoryScheme




                 84
CategoryScheme (MISSY)




                         85
CategoryScheme




                 86
Category




           87
MISSY (Category)




                   88
Category




           89
VariableScheme




                 90
VariableScheme (MISSY)




                         91
VariableScheme




                 92
Variable




           93
Variable (MISSY)




                   94
Variable




           95
Representation




                 96
Representation




                 97
Outline

   •   MISSY
   •   DDI-L Main Structures
   •   DDIInstance
   •   Comparison
   •   StudyUnit



   •   ConceptualComponent
   •   LogicalProduct
   •   DataCollection


                               98
DataCollection




                 99
DataCollection




                 100
QuestionScheme




                 101
QuestionScheme




                 102
QuestionItem




               103
QuestionItem (MISSY)




                       104
QuestionItem




               105
Response Domain




                  106
Response Domain




                  107
Instrument




             108
Instrument (SOEP)




http://www.diw.de/documents/dokumentenarchiv/17/diw_01.c.394158.de/soepfrabo_haushalt_2011.pdf   109
Instrument




             110
ControlConstruct




                   111
ControlConstructScheme




                         112
ControlConstruct




                   113
Sequence




           114
Sequence (bahavioral)




                        115
Sequence (SOEP)




http://www.diw.de/documents/dokumentenarchiv/17/diw_01.c.394158.de/soepfrabo_haushalt_2011.pdf   116
Sequence (structural)




                        117
StatementItem




Explanatory background related to questions


                                              118
StatementItem (behavioral)




                             119
StatementItem (SOEP)




http://www.diw.de/documents/dokumentenarchiv/17/diw_01.c.394158.de/soepfrabo_haushalt_2011.pdf   120
StatementItem (structural)




                             121
QuestionConstruct




                    122
QuestionConstruct (behavioral)




                                 123
QuestionConstruct (SOEP)




http://www.diw.de/documents/dokumentenarchiv/17/diw_01.c.394158.de/soepfrabo_haushalt_2011.pdf   124
QuestionConstruct (structural)




                                 125
IfThenElse




             126
IfThenElse (behavioral)




                          127
IfThenElse (SOEP)




http://www.diw.de/documents/dokumentenarchiv/17/diw_01.c.394158.de/soepfrabo_haushalt_2011.pdf   128
IfThenElse (structural)




                          129
Loop




       130
Loop (behavioral)




                    131
Loop (SOEP)




http://www.diw.de/documents/dokumentenarchiv/17/diw_01.c.394158.de/soepfrabo_haushalt_2011.pdf   132
Loop (structural)




                    133
RepeatWhile




              134
RepeatWhile (behavioral)




                           135
RepeatWhile (structural)




                           136
RepeatUntil




              137
RepeatUntil (behavioral)




                           138
RepeatUntil (structural)




                           139
Outline

   • PhysicalDataProduct
   • PhysicalInstance
   • DDIProfile



   • Colectica
PhysicalDataProduct




                      141
PhysicalDataProduct




• Physical layout of data that do not change when physical instance
  data files are merged or split
• Physical Data Structure

                                                                      142
Outline

   • PhysicalDataProduct
   • PhysicalInstance
   • DDIProfile



   • Colectica
PhysicalInstance




                   144
PhysicalInstance




• Physical instances of physical
  data products
• Represents data files



                                            145
Outline

   • PhysicalDataProduct
   • PhysicalInstance
   • DDIProfile



   • Colectica
DDIProfile




             147
DDIProfile




             148
DDIProfile




Describes which DDI-L elements you use in your institution’s DDI flavor
                                                                          149
Outline

   • PhysicalDataProduct
   • PhysicalInstance
   • DDIProfile



   • Colectica
Colectica




•   Commercial software tool
•   http://colectica.com/
•   Multiple versions for individuals, departments, and institutions
•   Multiple videos on the website for getting started
                                                                       151
Colectica Reader For Free




                            152
Colectica (Navigation)




                         153
Colectica (Variables)




                        154
Colectica (Variables)




                        155
Colectica (Questions)




                        156
Colectica (Codes & Categories)




                                 157
Feel free to ask any unsolved questions!




               Thomas Bosch
                  M.Sc. (TUM)
                  PhD student
          boschthomas.blogspot.com
GESIS - Leibniz Institute for the Social Sciences
                                                    158

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2013.02 - 7th Workshop of German Panel Surveys