The Assessment of "No Opinion" in Attitude Surveys

This research was supported by grants from the National Science Foundation (GS-39780 and SOC76-15040) and the National Institute of Mental Health (MH 24266). We are indebted to Jean M. Converse for advice at several stages and to Jacob Ludwig III for research assistance. At various points Philip E. Converse, Otis Dudley Duncan, William M. Mason, and J. E. Keith Smith provided valuable help with problems related to our analysis, though we alone are responsible for any errors. A brief version of the paper was given at the 1978 American Sociological Association meeting.