Rutz, Oliver J.; Trusov, Michael; Bucklin, Randolph E. - In: Marketing Science 30 (2011) 4, pp. 646-665
Many online shoppers initially acquired through paid search advertising later return to the same website directly …. These so-called "direct type-in" visits can be an important indirect effect of paid search. Because visitors come to sites …, especially at the keyword level, is difficult. First, standard paid search data are aggregated across consumers. Second, there …