2013.02 - 7th workshop of german panel surveys

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.comGESIS - Leibniz Institute for the Social Sciences

Outline

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• MISSY

• DDI-L Main Structures

• DDIInstance

• Comparison

• StudyUnit

• ConceptualComponent

• LogicalProduct

• DataCollection

Outline

• PhysicalDataProduct

• PhysicalInstance

• DDIProfile

• Colectica

Outline

4

• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

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, …)

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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

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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

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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

Use-Cases in Missy









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Flow Diagram

UML Class Diagrams

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Outline

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• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

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Modules

Outline

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• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

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DDIInstance

DDIInstance

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ResourcePackage

ResourcePackage

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Allows packaging of any maintainable item as a resource item

Structure to publish non-study-specific materials for reuse

ResourcePackage

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Any module (except: StudyUnit, Group, LocalHoldingPackage)

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Any Scheme (Banks)

Internal or external references to schemes and elements within schemes

ResourcePackage

Group

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Group

35Groups allow inheritance

Group

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Organization

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Organization

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Outline

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• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

Comparison (DDI 3.1)

1. ResourcePackage

2. Group

3. Comparison

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Comparison (MISSY)

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1. ResourcePackage

2. Group

3. Comparison

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References to same contents of ResourcePackages

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1. ResourcePackage

2. Group

3. Comparison

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label = 'variable age'

label = 'age'

Group (study and variable information)

--> variables in this group are comparable

--> inherit

--> overwrite variable information

+ easy to understand

- Implementation

- changes --> reorganize groups


1. ResourcePackage

2. Group

3. Comparison

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Comparison

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Comparison

Comparison

VariableMap

CategoryMap

CodeMap

ConceptMap

QuestionMap

UniverseMap

Why not more? good understanding of these elements

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Variable-Age Variable-AgeGroup

codes/categories codes categories

20 1 20 – 29

… … …

29 1 20 – 29

30 2 30 – 39

… … …

67 6 60 – 67

Comparison (Example)

VariableMap

Variable-Age --> Variable-AgeGroup

commonality, difference

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CodeMap


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20 1

… …

29 1

30 2

… …

67 6

CategoryMap


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20 20 – 29

… …

29 20 – 29

30 30 – 39

… …

67 60 – 69

Outline

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• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

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StudyUnit

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Coverage

Coverage

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TemporalCoverage

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TopicalCoverage

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SpatialCoverage

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SpatialCoverage

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TopicalCoverage

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TemporalCoverage

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Citation

Outline

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• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

ConceptualComponent

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ConceptualComponent

ConceptualComponent

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ConceptScheme

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ConceptScheme

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Concept

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Thematic Classification (MISSY)

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Concept

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Universe

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Universe

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Outline

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• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

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LogicalProduct

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LogicalProduct

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CodeScheme

CodeScheme (MISSY)

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CodeScheme

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Code

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Code (MISSY)

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Code

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CategoryScheme

CategoryScheme (MISSY)

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CategoryScheme

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Category

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MISSY (Category)

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Category

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VariableScheme

VariableScheme (MISSY)

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VariableScheme

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Variable

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Variable (MISSY)

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Variable

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Representation

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Representation

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Outline

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• MISSY


• DDIInstance

• Comparison

• StudyUnit


• LogicalProduct

• DataCollection

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DataCollection

DataCollection

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QuestionScheme

QuestionScheme

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QuestionItem

QuestionItem (MISSY)

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QuestionItem

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Response Domain

Response Domain

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Instrument

Instrument (SOEP)

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

Instrument

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ControlConstruct

ControlConstructScheme

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ControlConstruct

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Sequence

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Sequence (bahavioral)

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Sequence (SOEP)


Sequence (structural)

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StatementItem

Explanatory background related to questions

StatementItem (behavioral)

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StatementItem (SOEP)


StatementItem (structural)

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QuestionConstruct

QuestionConstruct (behavioral)

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QuestionConstruct (SOEP)


QuestionConstruct (structural)

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IfThenElse

IfThenElse (behavioral)

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IfThenElse (SOEP)


IfThenElse (structural)

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Loop

Loop (behavioral)

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Loop (SOEP)


Loop (structural)

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RepeatWhile

RepeatWhile (behavioral)

135

RepeatWhile (structural)

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RepeatUntil

RepeatUntil (behavioral)

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RepeatUntil (structural)

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Outline



• DDIProfile

• Colectica

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PhysicalDataProduct

PhysicalDataProduct

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

• Physical Data Structure

Outline



• DDIProfile

• Colectica

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PhysicalInstance

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PhysicalInstance

• Physical instances of physical

data products

• Represents data files

Outline



• DDIProfile

• Colectica

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DDIProfile

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DDIProfile

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DDIProfile

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

Outline



• DDIProfile

• Colectica

Colectica

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• Commercial software tool

• http://colectica.com/

• Multiple versions for individuals, departments, and institutions

• Multiple videos on the website for getting started

Colectica Reader For Free

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Colectica (Navigation)

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Colectica (Variables)

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Colectica (Variables)

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Colectica (Questions)

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Colectica (Codes & Categories)

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Feel free to ask any unsolved questions!

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Thomas Bosch

M.Sc. (TUM)PhD student

boschthomas.blogspot.comGESIS - Leibniz Institute for the Social Sciences

2013.02 - 7th workshop of german panel surveys

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