measuring the quality of the finnish population register with a survey special focus on non-response...
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Measuring the Quality of the Finnish Population Register with a Survey
Special focus on non-response
Päivi Hokka and Markku NieminenStatistics FinlandSurvey Research Unit
10th July 2008 2Päivi Hokka Q2008
Structure of the presentation
Aims and design of the Finnish Population Register Quality Study
Methods of investigating non-responseResults of the non-response analysis of 2007
10th July 2008 3Päivi Hokka Q2008
The Population Register
Contains basic information about Finnish and foreign citizens living permanently in Finland
Information is based on notifications made by private individuals and public authorities
Considered as a high-quality register also at the international level
10th July 2008 4Päivi Hokka Q2008
Quality Study
Register quality is examined with the help of a survey Idea: to ask people directly, whether the register information on
them is correct or not Conducted by Statistics Finland annually since 1998 Telephone interviews made by statistical interviewers The questions are added to the end of Statistics Finland's
Labour Force Study Sample size 11,000 (persons aged 15 - 74)
10th July 2008 5Päivi Hokka Q2008
Variables checked in the Quality Study
Permanent addressType of ownership of permanent homeNative languageOccupation
A citizen’s permanent address is the most important The interviewer reads out the address the respondent has
according the Population Register and asks, whether it was the address of his/her permanent home
10th July 2008 6Päivi Hokka Q2008
Answers to the question concerning permanent address in Quality Study 2007
% NPopulation Register address was respondent’s current address 98.8 9,489
Population Register address was not respondent’s current address 1.2 113
Total 100 9,602
Non-response = 1,205
10th July 2008 7Päivi Hokka Q2008
Non-response as a challenge
Response rate about 88 – 90 per centSample of 11,000 ——> over 1,000 non-response casesThreat for the credibility of the Quality Study
Since 2003, the validity of the permanent address variable has been intensively inquired for all non-response cases
10th July 2008Päivi Hokka Q2008
The non-response
1) People who can be contacted successfully, but who do not answer the questions
- most of them refuse
2) People who cannot be contacted at all
10th July 2008 9Päivi Hokka Q2008
Tactics in investigating non-response
The respondent or a substitute
contacted
A short questionabout the permanent
address
10th July 2008 10Päivi Hokka Q2008
Tactics in investigating non-response
The respondent or a substitute
contacted
No contact
A short questionabout the permanent
address
• Comparison with1) postal address register2) Fonecta Finder
• Visit in the address
10th July 2008Päivi Hokka Q2008
Correctness of addresses of non-response cases in 2007
% N
Population Register address was correct 91.0 1,096
Population Register address was incorrect 4.6 55
Population Register address could not be verified 4.4 54
Total 100 1,205
10th July 2008 12Päivi Hokka Q2008
Correct addresses among non-response (N=1,096)
27% checked from the respondent or a substitute23% checked with a visit
42% compared with the postal address register7% compared with Fonecta Finder
10th July 2008 13Päivi Hokka Q2008
Result of the Quality Study 2007 with and without non-response
* When non-response is included, the number of checked cases is 10,753. Missing are the 54 unchecked cases.
% N % NPopulation Register address was respondent’s current address
98.8 9,489 98.4 10,585
Population Register address was not respondent’s current address
1.2 113 1.6 168
Checked cases, total* 100 9,602 100 10,753
Without non-response With non-response
10th July 2008Päivi Hokka Q2008
Number of unresolved cases and share of correct addresses among non-response in 2003 - 2007
0
50
100
150
200
250
2003 2004 2005 2006 2007
Year
Unch
ecke
d ca
ses
(N)
9898,198,298,398,498,598,698,798,898,999
Unchecked cases (N)
Correct address %
Corr
ect
addr
ess
%
10th July 2008Päivi Hokka Q2008
Conclusions
By investigating the non-response cases, as many as 99.5 per cent of the permanent addresses of the sample could be checked
The quality of register information was found to be worse among the non-response cases than the respondents
The reservations in the Quality Study method are linked to the accuracy of the other databases used in comparisons
Intensified inquiries of non-response cases help in approaching the ”truth”
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