Poststratification without population level information on the poststratifying variable, with application to political polling

We investigate the construction of more precise estimates of a collection o f population means using information about a related variable in the contex t of repeated sample surveys. The method is illustrated using. poll results concerning presidential approval rating (our related variable is political party identification). We use poststratification to construct these improv ed estimates, but because we do not have population level information on th e poststratifying variable, we construct a model for the manner in which th e poststratifier develops over time. In this manner, we obtain more precise estimates without making possibly untenable assumptions about the dynamics of our variable of interest, the presidential approval rating.