Bontempi, Maria Elena; Lambertini, Luca; Medeossi, Erica - 2016
performance, in particular when the innovative effort is continuous. This paper aims to further the analysis on the duration of R … view of R&D duration within the European countries. Secondly, from a methodological point of view, we employ both discrete …- and continuous-time duration models, in order to test the Proportional Hazards (PH) assumption, i.e. the assumption that …