geog3025 census and administrative data sources 2: outputs and access
TRANSCRIPT
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GEOG3025
Census and administrative data sources
2: Outputs and access
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GEOG3025
Census and administrative data
• Lecture overviewObjectives of lecture
Introductory questions
2001 Census
Data outputs
Neighbourhood Statistics Service
Access mechanisms
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GEOG3025
Objectives• To introduce the the UK Censuses• To understand the different forms
of output• To recognise the difference
between the Census and Neighbourhood Statistics
• To be able to identify and obtain the appropriate census and neighbourhood data
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GEOG3025
2001 Census basics
• Separate censuses in England and Wales; Scotland; Northern Ireland
• Differences in questions, data output and access arrangements
• 200 years of the census (1801-2001, ex. 1941, inc. 1966)
• Statutory data collection exercise• Most detailed source of small area
data
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GEOG3025
What topics are covered?
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GEOG3025
Introductory questions…
How do we obtain access to the census datasets?
What output products are produced from the census?
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GEOG3025
2001 Census outputs• Multiple output products
– Aggregate statistics– Boundaries– Interaction data– Microdata– Lookup tables– Metadata
• NB national differences
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GEOG3025
Aggregate statistics
• Key statistics; census area statistics; standard tables (Previously small area statistics;local base statistics)
• Data aggregated to geographical areas
• 2001 lowest level is Output Area• Nested hierarchical geography• Threshold populations• Tabular layout for areas
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GEOG3025
1991 SAS table 5 layout
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GEOG3025
Digital boundary data
• Created by census organizations for the purposes of the census
• Nests within statutory geography (statistical wards)
• Different methodologies in Scotland (very) and NI (slightly)
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GEOG3025
2001 Output Areas England and Wales (n=175,434)
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GEOG3025
2001 OA
1991 Ward
1991 ED
Code-Point
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GEOG3025
Census interaction data
• Describes flows extracted from census returns– Journey to work– Migration from usual address one year ago
• To produce two datasets– Special Workplace Statistics– Special Migration Statistics
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GEOG3025
Samples of anonymised records
• Literally, a sample of anonymised records from actual census forms
• Known as microdata (internationally, public use microdata samples PUMS)
• 1991 2% sample of individuals (~LADs) and 1% sample of households (regions)
• Unique tabulations and analyses
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GEOG3025
ONS longitudinal study
• Since 1971, longitudinal microdataset• 4 DoBs, ~1% sample, ~500,000
persons• Confidentially linked records from
census, B&D and cancer registration• Unique resource for study of
socioeconomic lifecycle – esp. health• No direct researcher access to dataset
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GEOG3025
Problems with Using the Census
1. Census data go out of date quickly
2. People missing from the Census3. Census data are subject to other
inaccuracies4. Problems with comparison 5. Census data are aggregated
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GEOG3025
Census data access
• 2001 Census Access and Neighbourhood Statistics Service
• Pre-2001 data purchase• Academic access to all products
funded by ESRC/JISC Census Programmes
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Census Access
Pre-2001 datasets2001 datasets
Census organizations Other data suppliers
ESRC/JISCOther Census Access partners Data support
units
Registration service
Academic census users
integrated dataset services
Users
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GEOG3025
Academic access agreements
Census organizations
ESRCData registrar
Data redistributors
End users
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GEOG3025
Neighbourhood Statistics Service
• Government departments contributing datasets derived from administrative records
• Aggregating initially to 1998 wards, soon to be super output areas (SOAs)
• Varying levels of SOA reflect sensitivity of different administrative datasets
• No facilities for bulk/research download
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GEOG3025
Neighbourhood Statistics Service
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GEOG3025
NeSS Interactive Mapping
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GEOG3025
NeSS thematic mapping
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GEOG3025
Log on by clicking icon
Using Casweb
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GEOG3025
Click here to start
Select dataset of interest
Dataset selection
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GEOG3025
Select country
Select country
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GEOG3025
Define area of interest
Step through hierarchy, progress highlighted in geography selection diagram
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GEOG3025
Select output geography
Complete selection of areas of interest, and then choose level of output geography
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GEOG3025
Choose census table
Select the census table containing the data required
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GEOG3025
Select variables from the table
Check boxes representing the cells for which data are required, variables are added to current selection list
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GEOG3025
Options for data download
Specify output requirements – plain text or GIS format
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GEOG3025
Download data file to own PC
Click to download specified data in requested format
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GEOG3025
Load data into own software
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GEOG3025
Assignment 5/Coursework 1
• Use Casweb to obtain additional Census data for your chosen neighbourhood: major changes from 1991?
• Neighbourhood description wrt literature
• Use data to provide neighbourhood profile
• Assessment of geography compatibility
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GEOG3025
Lecture summary
• Census basics• Census output products• Census access arrangements• Neighbourhood Statistics Service
– Ease of access but limited download
• Academic access to census– Aggregate statistics from Casweb