Stephan, Paula; Gurmu, Shiferaw; Sumell, Albert; Black, … - In: Economics of Innovation and New Technology 16 (2007) 2, pp. 71-99
We use the Survey of Doctorate Recipients to examine the question of who in US universities is patenting. Because standard methods of estimation are not directly applicable, we use a zero-inflated negative binomial model to estimate the patent equation, using instruments for the number of...