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									LFS Non-response Data on Migrants
                                Laura Keyse
                Office for National Statistics
Structure
1. Introduction to LFS Sample Design,
  Response Rate Trends and Characteristics
  of Non-responders

2. Non-response Data on Migrants


3. Conclusions
LFS Sample Design
• Systematic random sample – 53,000 responding
 households per quarter

• GB addresses sampled from the Postcode Address
 File

• Each quarter’s sample comprises five waves of
 households

• Wave 1 = face-to-face interview

• Waves 2-5 = telephone interview
Wave Specific Response Rates
Composition of Non-response

100%
       13.3   13.1   11.2
                              Non-contact
80%    17.6
              25.4   28.8
                              Refusal to re-
60%    16.4                   interview
              14.5   15.8
                              Refusal to HQ
40%
       45.8
              40.8   39.1
20%                           Outright
                              refusal
       6.9    6.2    5.1
 0%                           Circumstantial
       JS07   JS06   JA05     refusal
Characteristics of Non-responders: Non-
contacts
2001 Census-linked study (Freeth, 2004) showed non-
  contact in wave one of the LFS most likely to occur in
  households:
• located in the Midlands, East of England, London and the
  South East
• living in a purpose-built flat or converted/shared house
• containing one adult only

The HRP of difficult-to-contact households tended to be:
• single, separated, divorced or widowed
• born outside the UK
• an employee or self-employed
Characteristics of non-responders: Refusals
Refusal most likely to happen in households:

• located in the Midlands, East of England, London,
 South East, South West and Scotland

• whose HRP did not have degree level
 qualifications

NB: No relationship between country of birth and
 wave one refusal rate
Non-response on Migrants: Definitions
• Migrants defined as HRPs born outside the UK


• Non-migrants defined as UK-born HRPs


• Note - differs from UN definition:
“A person who moves to a country other than that of
 his or her usual residence for a period of at least a
 year (12 months), so that the country of destination
 effectively becomes his or her new country of usual
 residence”
Non-response on Migrants : Method
• Attrition rate calculated for waves 2-5 of all
 quarters of the 2005 and 2006 LFS

• Attrition rate: how many HRPs failed to take part in
 a specific wave as a proportion of those which took
 part in the previous wave

• e.g. wave 2 attrition rate shows how many HRPs
 dropped out in wave 2 as a proportion of those that
 completed a wave 1 interview
Wave Specific Attrition Rates (Non-contacts + Refusals)


 35%
 30%
 25%
 20%
                                               Migrants
 15%
                                               Non-migrants
 10%
  5%
  0%
        Wave 2   Wave 3    Wave 4    Wave 5
Wave Specific Non-contact Rates
35

30

25

20
                                         Migrants
                                         Non-migrants
15

10

 5

 0
     Wave 2   Wave 3   Wave 4   Wave 5
Wave Specific Refusal Rates

 25%
 20%
 15%
                                           Migrants
 10%
                                           Non-migrants
 5%
 0%
       Wave 2   Wave 3   Wave 4   Wave 5
                                     Composition of Non-response

                  Non-Migrants                                                       Migrants
100%                                                       100%
 90%                                                       90%
                                        Non-contact                                                   Non-contact
 80%                                                       80%
70%                                     R efusal to re-    70%
                                                                                                      R efusal to re-
60%                                     interview          60%                                        interview
50%                                     C ircumstantial    50%                                        C ircumstantial
                                        refusal                                                       refusal
40%                                                        40%
                                        Outright refusal                                              Outright refusal
30%                                                        30%
20%                                     HQ refusal         20%                                        HQ refusal
10%                                                        10%
 0%                                                         0%
       Wave 2 Wave 3 Wave 4 Wave 5                                Wave 2   Wave 3   Wave 4   Wave 5
Reasons for Refusal at Waves 2-5
Reason for refusal           Migrants   Non-
                                        migrants
Broken appointment           44.6       47.1
Too busy                     15.0       13.9
About to go away             8.8        8.5
Other                        7.7        5.4
Personal problems            6.3        9.9
Cannot be bothered           5.4        6.5
Language difficulties        3.7        0.2
Invasion of privacy          1.8        2.0
Doesn’t believe in surveys   1.6        1.7
Anti-government              0.4        0.4
Waves 2-5 Attrition Rates by Region
   North East
  North West
  Merseyside
    Yorkshire
East Midlands
West Midlands
      Eastern
      London
   South East
  South West
       Wales
     Scotland
                0   5     10       15    20       25   30

                        Migrants   Non-migrants
Summary
• LFS response rates have declined over the last
  decade
• Wave one non-contact rate higher for migrants
• Attrition, non-contact and refusal rates higher for
  migrants at waves 2-5
• Composition of non-response is similar for
  migrants and non-migrants at waves 2-5
• Similar reasons for refusal given by migrants and
  non-migrants
• Migrant attrition rate is highest in London
email: laura.keyse@ons.gov.uk
Note on European Commission funding
and information contained in presentation
• The project which has been reported in this
 presentation was funded by the European
 Commission.

• However, the information presented is the sole
 responsibility of the author.

• The European Commission is not responsible for
 any use that may be made of the information
 contained herein.

								
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