Sample Co-ordination for the Scottish Government’s Major Cross-Sectional Population Surveys

Alex Stannard, Scottish Government

Overview

• Background• Process• Design effects• Common Geography

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.

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

Survey Design Process

Identify needs

Effective sample

sizes

Design effects

Target sample

sizes

Responseand

deadwood

Sample co-ordination

Design effects

Scottish Household Survey

Estimated historic design effects

Calculated for each strata then combined for each Local Authority

c

cu

u deffN

Ndeff

N

NDeff

Design effects

yvar

ccu

u yn

ny

n

nvarvar

2

2

2

2

cc

ccu

u

uu deffnn

ndeff

nn

n 2

2

22

2

2

c

cu

u deffn

ndeff

n

n

n

2

=

=

=

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

Sample co-ordination

• Used Address File• Common geography

Households

Data zone 365

Intermediate Geography

1 922

Multi-member ward 6 726

Constituency 32 525

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

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

Common geography

• Mainland PSUsSCJS – data zones

SHS – data zones

SHeS – intermediate geographies

• Island PSUsSCJS – data zones

SHeS – data zones

Sample Co-ordination

Plans

• Surveys will go into in the field in 2012

• First data available Summer/Autumn 2013