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On disclosure, in addition to the identities of the research sponsor and field work provider, we require a detailed statement of methodology, the full questionnaire and complete marginal data. (See Langer, Public Perspective, May 2003. To achieve greater consistency and reduce the chance of large weights, in January 2008 we adopted iterative weighting, also known as raking or rim weighting, in which the sample is weighted sequentially to Census targets one variable at a time, continuing until the optimum distribution is achieved. For missing data, a weighting cell is set to 1% for respondents who did not answer a given question used in weighting, and the substantive categories are adjusted by multiplying the ACS benchmarks by 0.99. We analyze subgroups only as small as 100 cases (or very near it). <>
... Party ID benchmarks are from recent ABC News/Washington Post telephone polls. Allowing for some overlap of these groups, the frame covers approximately 95 percent of the target population, U.S. adults age 18+. 3 0 obj
Surveys commonly are weighted to the number of telephone lines in each respondent’s home to adjust for the higher probability of selection of multiple-line households. Cell-only respondents are not offered compensation, but a reimbursement check is offered if use of minutes is raised as an objection. ICPSR06816-v1. Jury: Black bikers' race was a factor, but city won't pay, Permanent resident facing deportation hoping for Biden's help: 'Need a miracle', Fall 2013 issue of the Journal of Survey Statistics and Methodology, Merkle, Langer, Cohen, Piekarski, Benford & Lambert, 2009, Public Opinion Quarterly, Merkle & Langer, Public Opinion Quarterly, Spring 2008, Consequences of Reducing Nonresponse in a National Telephone Survey, Gauging the Impact of Growing Nonresponse on Estimates from a National RDD Telephone Survey, The Causes and Consequences of Response Rates in Surveys by the News Media and Government Contractor Survey Research Firms, Public Opinion Polling in a Globalized World. ... ABC News, and The Washington Post. For exchanges or 1,000-blocks that have been classified by their carrier as providing both landline and wireless service, each 100-block is compared to the database of landline 100-blocks; 100-blocks that appear on the landline frame are removed from the wireless frame and 100-blocks with no directory-listed numbers are retained. Methodologically, in all or nearly all cases we require a probability-based sample, with high levels of coverage of a credible sampling frame. Pre-election polling presents particular challenges. Landline numbers are drawn proportionate to their estimated distribution in the country’s nine Census divisions. In the second stage of selection, telephone numbers are sorted within county by area code, exchange and active block, and using systematic sampling procedures from a random start, individual phone numbers within each county are selected. 24/7 coverage of breaking news and live events. Numbers are called multiple times during the field period in multi-night polls; the standard for full-length ABC/Post polls is a minimum of six calls to each number. As a result of this evaluation, we do not exclude listed business numbers from our landline sample, with the exception of those in business-only blocks or exchanges. In July 2015, post-stratification by sample type was discontinued and Census region and phone service (landline only, dual service and cell-only) were added to the rim weighting variables. <>
Ignore polls — Newt Gingrich (@newtgingrich) November 1, 2016 It cannot be assumed that a higher response rate in and of itself ensures greater data integrity. Interviews are conducted via a computer-assisted telephone interviewing (CATI) system. From October 2008 through June 2015 we added c… endobj
On the other hand, surveys that, for instance, do no within-household selection, or use listed-only samples, will increase their cooperation or contact rates (and therefore response rates), but at the expense of random selection or population coverage. �T��"f�����Ӳ"���B�H1P�DI��K(#�(0�*6�
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