Key points are not available for this paper at this time.
An earlier version of this chapter was presented at the annual meeting of the American Sociological Association, September 1978, San Francisco. The authors are grateful to George Bohrnstedt, Peter Burke, Richard Campbell, Lowell Hargens, David Knoke, and Sociological Methodology's editorial group for helpful suggestions on an earlier draft. The authors assume sole responsibility for the contents of the chapter.
Alwin et al. (Tue,) studied this question.