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Optimal Contact Strategy in a Mail and Web Mixed Mode Survey

Optimal Contact Strategy in a Mail and Web Mixed Mode Survey. Anders Holmberg, Boris Lorenc and Peter Werner Statistics Sweden E-mail: name.surname@scb.se. NTTS Conference Brussels, Belgium February 2008. Outline. Introduction to the problem The design of the experiment Results

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Optimal Contact Strategy in a Mail and Web Mixed Mode Survey

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  1. Optimal Contact Strategy in a Mail and Web Mixed Mode Survey Anders Holmberg, Boris Lorenc and Peter Werner Statistics Sweden E-mail: name.surname@scb.se NTTS Conference Brussels, Belgium February 2008

  2. Outline • Introduction to the problem • The design of the experiment • Results • Summary and conclusions European Conference on Quality in Official Statistics Rome, Italy July 11, 2008

  3. Introduction to the problem • Swedish individual and household surveys with Self-Administered Questionnaires (SAQ) • The problem: low use of the web alternative • belief in rationality of the web mode (editing, other quality aspects, cost, environment) • cannot publicly afford the Web mode only • possibly, a mode switch (more of which later) • goal: investigating if changed contact strategies can increase the proportion of web respondents and a cost reduction, without harming the response rate European Conference on Quality in Official Statistics Rome, Italy July 11, 2008

  4. Background • PAP (mail Q) as the standard mode for SAQ • cover letter, questionnaire, return envelope, in some cases separate instruction, incentives. • response rates – as elsewhere – fall gradually • Web as an alternative mode for SAQ • introduced in the 2000’s for ind/hh surveys in Sweden • with the expectations of; easier input editing, higher response rate, cost reduction, and greater acceptance • carried out by including a paper sheet in the above, with an URL and login data • Reminders European Conference on Quality in Official Statistics Rome, Italy July 11, 2008

  5. Experiment groups European Conference on Quality in Official Statistics Rome, Italy July 11, 2008

  6. Results European Conference on Quality in Official Statistics Rome, Italy July 11, 2008

  7. Response rate and web response rate for S, A2 and A4 proportion No of Days

  8. Summary and Conclusions • Web intensive contact strategies considerably increases the web response rate • With a sample size of 20 000 a cost reduction between 12% and 20% compared to the cost of the standard strategy can be obtained • The effect on the response rate is very small • Statistics Sweden are developing routines and will change standard to a more web intensive contact strategy. European Conference on Quality in Official Statistics Rome, Italy July 11, 2008

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