He had been invited to Princeton by Oskar Morgenstern to participate in his Econometric Research Project .
Granger spent the next academic year , 1959 -- 60 , in the USA at Princeton University under a Harkness Fellowship of the Commonwealth Fund .
Granger had been invited to Princeton by Oskar Morgenstern to participate in Granger 's Econometric Research Project .
Granger spent the next academic year , 1959 -- 60 , in the USA at Princeton University under a Harkness Fellowship of the Commonwealth Fund .