r esearch paper s eries research no 1948 empirical analysis of indirect network effects in the market for personal digital assistants harikesh nair pradeep chintagunta jean pierre dubé october 2003 nair1 assistant professor marketing graduate school business stanford university 518 memorial way ca 94305 email edu phone 650 736 4256 fax 725 9932 robert law chicago 1101 east 58th street il 60637 e mail gsb uchicago 773 702 8015 0458 jdube 834 5377 may 14 this version 3 1 we thank editor associate and an anonymous referee detailed comments suggestions that significantly improved earlier draft sukumar sima vasa chris bodmer npd group clarifications help with data jason
