Appendix D
Generation Peace Survey research methods
The "Generation Peace" survey was commissioned by the Shinnyo-en Foundation. The survey questions were designed by the Research Division of Fleishman-Hillard International Communications. The survey was fielded and tabulated by Opinion Research Corporation.
The survey was conducted among a sample of 1,786 adults comprising 847 men and 939 women 18 years of age and older.
The online omnibus study is conducted twice a week among a demographically representative U.S. sample of 1,000 adults 18 years of age and older using Greenfield Online sample. Interviewing for this survey was completed across three waves from February 7 through February 17, 2008.
- On the first two waves, the questions were asked only of 696 people age 18 to 34.
- On the third wave, the questions were asked of all 1,090 participants so that comparisons could be made between younger adults and others age 35 and older.
Completed interviews are weighted by four variables: age, sex, geographic region, and race, to ensure reliable and accurate representation of the total U.S. population, 18 years of age and older. The raw data are weighted by a custom-designed program which automatically develops a weighting factor for each respondent. Each respondent is assigned a single weight derived from the relationship between the actual proportion of the population based on U.S. Census data with its specific combination of age, sex, geographic characteristics and race and the proportion in the sample. Tabular results show both weighted and unweighted bases. For this survey sample, young adults were over-sampled. The weighting procedures compensate for this by calculating an appropriately lesser weight for young adults and a corresponding greater weight for older adults.
Respondents for this survey were selected from among those who have volunteered to participate in online surveys and polls. The data have been weighted to reflect the demographic composition of the 18+ population. Because the sample is based on those who initially self-selected for participation, no estimates of sampling error can be calculated. All sample surveys and polls may be subject to multiple sources of error, including, but not limited to sampling error, coverage error, error associated with nonresponse, error associated with question wording and response options, and post-survey weighting and adjustments.
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