The August 2011 Political Survey, sponsored by the Pew Research Center, obtained telephone interviews with a nationally representative sample of 1,509 adults living in the continental United States. Interviews were conducted via landline (nLL=905) and cell phone (nC=604, including 268 without a landline phone). The survey was conducted by Princeton Survey Research Associates International. The interviews were conducted in English and Spanish by Princeton Data Source from Aug. 17-21, 2011. This survey contains questions on attitudes towards terrorism and Islam.
- Data File
- Cases: 1,509
Weight Variable: WEIGHT
- Data Collection
- Date Collected: Aug. 17-21, 2011
- Original Survey (Instrument)
- August 2011 Political Survey
- Funded By
- Pew Research Center
- Collection Procedures
- A combination of landline and cellular random digit dial (RDD) samples was used to represent all adults in the continental United States who have access to either a landline or cellular telephone. Both samples were provided by Survey Sampling International, LLC (SSI) according to PSRAI specifications.
Numbers for the landline sample were drawn with equal probabilities from active blocks (area code + exchange + two-digit block number) that contained three or more residential directory listings. The cellular sample was not list-assisted, but was drawn through a systematic sampling from dedicated wireless 100-blocks and shared service 100-blocks with no directory-listed landline numbers.
- Sampling Procedures
- Interviews were conducted from Aug. 17-21, 2011. As many as seven attempts were made to contact every sampled telephone number. Sample was released for interviewing in replicates, which are representative subsamples of the larger sample. Using replicates to control the release of sample ensures that complete call procedures are followed for the entire sample. Calls were staggered over times of day and days of the week to maximize the chance of making contact with potential respondents. Interviewing was spread as evenly as possible across the days in field. Each telephone number was called at least one time during the day in an attempt to complete an interview.
For the landline sample, interviewers asked to speak with the youngest adult male or female currently at home based on a random rotation. If no male/female was available, interviewers asked to speak with the youngest adult of the other gender. This systematic respondent selection technique has been shown to produce samples that closely mirror the population in terms of age and gender when combined with cell interviewing.
For the cellular sample, interviews were conducted with the person who answered the phone. Interviewers verified that the person was an adult and in a safe place before administering the survey. Cellular respondents were offered a post-paid cash reimbursement for their participation.
Statistical results are weighted to correct known demographic discrepancies. The margin of sampling error for the complete set of weighted data is ±3.0 percentage points.
- Principal Investigators
- Pew Research Center