dr. michael r. hyman, nmsu response rates and survey costs
Post on 20-Dec-2015
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Dr. Michael R. Hyman, NMSU
Response Rates and Survey Costs
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Aspects of Non-response Error
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Response Rate: Telephone
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Effects of Strategies for Handling Not-at-Homes
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Unlisted Telephone Numbers
• Telephone sampling used to mean sampling from directories. However, large proportion of households are unlisted (i.e., non-published).
• Nationally, 27.6% of households have unlisted numbers.
• In many cities, the unlisted rate is over 50%. • California is especially bad, with most cities over
50% (Los Angeles is 56% unlisted).
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Most Unlisted Phones in U.S.
• Sacramento, CA
• Oakland, CA
• Fresno, CA
• Los Angles/Long Beach, CA
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12The Frame, 11/2001, Published by Survey Sampling, Inc.
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Differences Between Listed and Unlisted Households
• Listing increases with age: 50+% of households headed by 18-34 year olds and roughly 40% headed by 35-54 year olds are unlisted.
• Among people who moved in the past two years, 59% are unlisted. Although some choose to be unlisted, most unlisted people moved since the last directory was published.
• Unlisted householders tend disproportionately to be unmarried and renters.
• Unlisted households are not higher income.
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• Write a sales-oriented cover letter• Money helps
- As a token of appreciation- For a charity
• Ask interesting questions• Follow up
- Keying questionnaires with codes• Advanced notification• Sponsorship by a well-known and
prestigious institution
How to Increase Response Rates for Mail Surveys
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Example of Ways to Increase Response Rate to Mail Survey
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Relative Costs
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Cost Data for Interviewing Methods
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Fielding a Telephone Study
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