Assessing the Accuracy of Polls and Surveys

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Science  28 Nov 1986:
Vol. 234, Issue 4780, pp. 1094-1098
DOI: 10.1126/science.234.4780.1094


Direct measurements of public opinion about national affairs appear with increasing frequency in all of the mass media. While such survey results are often with statements as to expected error margins, discrepancies between multiple surveys in the news at the same time on what seem to be the same topics may convince casual consumers that such error margins must be considerably understated. A brief review of the several sources of variability and fixed bias in such surveys provides a clearer frame of reference for the evaluation of such data.