or output of a knowledge production function. We suggest that the productivity of research in patent production functions … to patentable knowledge, and development happens after the initial research phase that may have led to a patent. Instead … of using data on R&D, we separate the knowledge creating process into 'R' and 'D'. This data stems from R&D surveys of …

knowledge spillovers are unmeasurable, a 'goodness of fit' measure is constructed using innovation survey data. It turns out …In this paper it is tested which of the various alternative approaches for constructing knowledge spillover pools … that measures of the uncentered correlation of firm characteristics seem to fit actual knowledge spillovers best. Direct …