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National Boot camp
Vancouver
Heather Dryburgh and Michel B. Séguin
May 31st, 2011
Survey Life cycle
06/05/2013 Statistics Canada • Statistique Canada 2
What the heck is
a survey?
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WHAT IS A SURVEY?
The collection of information from
• People
• Businesses
• Organizations
• Farms
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TYPES OF SURVEYS
CENSUS
• Includes all units of
the population
SAMPLE
Includes some units of the
population which represent
the population
Regular surveys
Supplementary surveys
Post-censal surveys
Longitudinal surveys
PROXY OR NON-PROXY
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MAJOR COMPONENTS
OF A SURVEY
WHO WHAT HOW WHAT ARE
YOU DOING
TO IT
WHAT’S THE
NEWS
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WHO?????
What is the universe
Is it a census or a sample
Sample
Based on the geography
Based on the age
Based on presence of children in household
Is the sample representative or not of the universe
Sample size will be defined according to geography of dissemination
Is the sample based on population, households, families, farms
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WHAT?????
Questionnaire design
Concepts and definitions
Wording of questions
Closed questions – open-ended questions
- Coding of open-ended questions
- Single and multiple responses
Measured or self-reported
Flows and skip patterns – questionnaire layout
Instructions for Interviewers
Computer Assisted Applications
Testing of questions (may take 2-3 cycles to test a question)
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HOW???
In person – Computer assisted personal interviews (CAPI)
By telephone – Computer assisted telephone interviews (CATI)
Mail out – Mail back
Internet
Visit to clinic
TRAINING OF INTERVIEWERS
INSTRUCTION TO INTERVIEWERS
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HOW???
Respondent relations
• Purpose of survey
• Confidentiality assurances
• Volunteer / mandatory aspects of survey
• Projects for linking data
• Projects for sharing of data
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WHAT ARE WE DOING
WITH THE DATA???
Processing the data • Editing errors
– Interviewers errors
– Capture errors
– Respondent errors
• Inter-question relationships
• Path and flows
• Coding of write-in responses
• Imputations for non-response or response error
• Creation of variables and derived variables
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PROCESSING THE DATA
Imputation of Data from Other Records on File
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PROCESSING THE DATA
The end product of processing = master file!
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PROCESSING THE DATA
Weights are added to the Master file
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PROCESSING THE DATA
Weights are added to the Master file
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WHAT’S THE NEWS???
WE are now in the DISSEMINATION mode
Articles in the Daily and Summary Tables
Tables in CANSIM
Internet Publications
Public Use Microdata Files
Masterfiles/Sharefiles in the RDC
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WHAT’S THE NEWS???
PUBLIC USE MICRODATA FILES • Subset of the Master file
• Variables and derived variables
• No personal identifiers
• Extremes that could lead to identify someone are removed
• Geographies are regrouped as required Some provinces, some CMAs, Urban/Rural
• Multiple revisions following visits to the Microdata Release Committee
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WHAT’S THE NEWS???
PUBLIC USE MICRODATA FILES
• Data file
• Documentation Users guide
Code book
Record layout
Questionnaire
Variables and derived variables index
Variance tables
SPSS format file
SAS format file
This is ideal… you don’t always get all these files….
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NOW THAT YOU HAVE THE DATA,
HAVE FUN…
