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Three-wave panel data collected during the 1968 presidential election campaign in Florida and North Carolina are analyzed on the basis of the partial candidate preference information available for some respondents and the complete information obtained from others. A supplemented marginals model based on die general linear approach to categorical data analysis is extended to the situation involving incomplete time data. The final statistical models show no politically significant effects associated with the campaign (time) on the level of citizens' preferences for Hubert Humphrey, Richard Nixon, or George Wallace for seven race and occupation classifications.
Lehnen et al. (Tue,) studied this question.