The Party Preference Survey in November 2011 was conducted by telephone interviews of a national random probability sample consisting of 9 060 persons entitled to vote in the Riksdag election, without an upper age limit. Of these persons, 13.9 percent could not be reached (including unlisted telephone numbers and those without telephones), 3.7 percent were too ill to be interviewed and 17.2 percent did not want to be interviewed. The total non-response rate was 34.8 percent. A total of 5 907 interviews were conducted. In addition, some persons did not want to answer certain questions. The interviews were conducted by telephone during the period 1 - 27 November. The majority of the interviews were conducted during the first half of the measuring period. 77 percent of the interviews had been conducted up to and including 16 November.
The results are presented in intervals or point estimations ± margins of error. The interval that is created of the percent estimation ± margin of error here is a 95 percent confidence interval, which is an interval with a 95 percent probability including the actual value of the population, if no systematic errors occur.