Sample Co-ordination for the Scottish Government’s Major Cross-Sectional Population Surveys
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Sample Co-ordination for the Scottish Government’s Major Cross-Sectional Population Surveys
Alex Stannard, Scottish Government
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Overview
• Background• Process• Design effects• Common Geography
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Long Term Survey Strategy
• To ensure that the Scottish Government's population surveys meet key information needs while maximising the analytical potential of the data they generate, the precision of estimates and value for money.
• To give full consideration to issues of survey participation, respondent burden, data quality and data security and to make recommendations that align survey practice across Government and promote good practice to other public bodies.
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Sample requirements
SHS+
SHCS
SHeS SCJS
Frequency Continuous Continuous Biennial
Geography of primary interest
LA HB PFA
Household sample size per sweep
c11k c3.5k c13k
Clustering Possibly Yes – 100%
Possibly
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Survey Design Process
Identify needs
Effective sample
sizes
Design effects
Target sample
sizes
Responseand
deadwood
Sample co-ordination
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Design effects
Scottish Household Survey
Estimated historic design effects
Calculated for each strata then combined for each Local Authority
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Design effects
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Design effects
Option 1 Option 2 Option 3
Aberdeenshire 1.05 1.28 1.36
Angus 1.05 1.11 1.19
Argyll and Bute 1.05 1.42 1.50
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Sample co-ordination
• Used Address File• Common geography
Households
Data zone 365
Intermediate Geography
1 922
Multi-member ward 6 726
Constituency 32 525
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Sample co-ordination
Scottish Household Survey
Samp Size per sweep
DZs per sweep
Samp per DZ
IGs per sweep
Samp per IG
Aberdeen City 581 67 8.7 12 49.4
Aberdeen-shire 638 75 8.5 14 44.7
Angus 429 36 12.1 6 68.6
Argyll & Bute 541 31 17.7 6 98.3
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Sample co-ordination
Scottish Health Survey
Samp Size per sweep
DZs per sweep
Samp per DZ
IGs per sweep
Samp per IG
Forth Valley 181 93 1.9 19 9.8
Grampian 355 171 2.1 32 11.1
Lothian 487 248 2.0 44 11.0
Orkney 69 8 9.3 2 39.7
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Common geography
• Mainland PSUsSCJS – data zones
SHS – data zones
SHeS – intermediate geographies
• Island PSUsSCJS – data zones
SHeS – data zones
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Sample Co-ordination
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Plans
• Surveys will go into in the field in 2012
• First data available Summer/Autumn 2013