Questasy
A web application for online data
dissemination based on DDI 3
Alerk Amin
Marika Puumala
10/3/2015
Contents
• Background & requirements
• Solution: Questasy & DDI 3
• Demonstration
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Background
• CentERdata
•
LISS panel
– Online panel of ~8000 individuals
– Free survey data & data collection
– Diverse questionnaires each month
(~30 mins in total)
– Disseminate all data
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Diversity of Surveys
• Various topics
• Single wave studies
– e.g. European Value Survey (partial)
• Longitudinal studies
– e.g. LISS Core Study
• Varying data collection frequency
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Objectives for Data Dissemination
• Previously
– No dissemination tool or standard
– Data delivered ‘ad hoc’ in SPSS files +
Word codebooks
• Goal
– Disseminate all data collected in the
panel via a website
(www.lissdata.nl)
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Dissemination Requirements
• Complete documentation in database
– Studies, questions, variables, …
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•
Longitudinal/multi-measure studies
•
Public and restricted access +
administrator views
•
Advanced search
•
Multiple languages
•
Use an international standard -> DDI 3
Solution: Questasy
• Developed by CentERdata
• Web application
• Manage and distribute survey data and
metadata
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Questasy Website Integration
www.lissdata.nl
/lissdata
Static
Web Pages
(External)
/dataarchive
Researcher
Interface
(External)
Administrator
Interface
(Internal)
Database
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Questasy
Questasy Implementation
• PHP / MYSQL
• MVC Architecture
• Model based on DDI 3
• Search
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DDI 3 Relationships in Model
Question
Scheme
(n:1)
Response
Domain
(n:1)
Concepts
(n:m)
Question
Item
Variables
(n:m)
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Question
Constructs
(1:n)
DDI 3 in Database
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Search
• Researcher interface
• Sphinx search engine
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Demonstration
www.lissdata.nl
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