METHODOLOGICAL BIAS IN PUBLIC OPINION SURVEYS
In: Public opinion quarterly: journal of the American Association for Public Opinion Research, Band 36, Heft 1, S. 105-108
ISSN: 0033-362X
Statistically designed sample surveys have enabled pollsters to gauge PO on a wide range of issues. In such surveys, selection of a data collection technique is generally based on 4 criteria: (1) cost; (2) completion time; (3) response rate; & (4) response bias. Typically, more weight is placed on the 1st 3 factors &, as a result, adequate attention has not been given to the latter consideration. The study described looks at one type of response bias-that which results from the use of a specific data collection method. More specifically, this res uses a controlled exp'al design in order to determine whether responses given in a PO polling are influenced by the method used to collect the data. 3 methods are investigated: (1) a mail questionaire (2) a telephone interview; & (3) personal interview. The major finding from the study is that responses are not always independent of the method used to collect the data & that this form of response bias is likely to be a problem in telephone & personal interviews whenever the question being asked is one for which there exists a soc'ly undesirable response. AA.