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Assessing the quality impacts of posting Census Questionnaires. Garnett Compton Q2008 Conference, 8-11 July 2008. Overview. Setting the scene – Post-out and the 2007 Census Test Differences in response Quality of the address register Costs Other quality and operational impacts
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Assessing the quality impacts of posting Census Questionnaires Garnett Compton Q2008 Conference, 8-11 July 2008
Overview • Setting the scene – Post-out and the 2007 Census Test • Differences in response • Quality of the address register • Costs • Other quality and operational impacts • Conclusions and questions
Why consider Post-out? • To reduce serious risks experienced in 2001, in particular the failure to recruit a large number of enumerators. • To provide savings to invest in improving response. • Because of the limited success of making contact at delivery.
Address register coverage • 680 (1.3%) new addresses found during enumeration in hand delivery areas • Nearly 70% of new addresses were sub-premise addresses – suggest existed at time of AC. • About 20% found already existing/available latest update. • About 1/6 found in hand delivery areas during follow-up
Estimated Cost Savings * At the start of follow-up – 23 May
Quality and operational impacts • No difference in under/over count between two methods • No difference in number failing 2 of 4 rule • No large difference in age/sex distributions between delivery methods • 50% more calls to the contact centre in post-out areas • CTES: • No difference in views on “junk” mail • Small difference recognised as “official” mail
Conclusions • Post-out has an impact on return rates, but not success at follow-up. Post-out requires more follow-up to obtain same overall response rate. • Differences in return rates are not affected by the hard to count characteristics of an area (i.e. the ETC). • No significant differences in response quality • A post-out methodology will allow savings to invest in targeted follow-up and community liaison. • The levels of AR undercoverage will be small with minimal, but manageable, impact on the overall quality. • Some operational impacts but manageable through design and development
Thank you Any Questions?