Age is among the strongest predictors of political participation, yet it is also among the least well understood. We offer a model of participation in the U.S. voter registration system - the first step in the voting process. In this model, older people are more apt to participate than younger...

The cell-phone-only (CPO) population has grown rapidly over the past several years, causing concern for researchers who rely mostly on random digit dialing (RDD) of landlines to conduct their research. While early research on CPOs has focused largely on age differences, CPOs may differ from...