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- W4283581218 abstract "Abstract This study provides an assessment of the R&D–patent relation of European pharmaceutical firms that are not flawed by endogeneity biases. Firms invest in R&D and generate latent knowledge which then manifests in observable patent outcomes through a Poisson model. The process of turning R&D into knowledge is described by a production process subject to inefficiency and endogeneity. To estimate a Poisson stochastic frontier model, the suggested novel copula‐based approach directly accounts for the dependence between the endogenous regressors and the inefficiency component. Hence, its implementation does not require any instrumental variables. Simulation results underline that the proposed estimator outperforms conventional instrumental variable estimators. Neglecting endogeneity leads to a substantial underestimation of the R&D elasticity of patents generated in the European pharmaceutical industry." @default.
- W4283581218 created "2022-06-28" @default.
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- W4283581218 date "2022-06-27" @default.
- W4283581218 modified "2023-09-28" @default.
- W4283581218 title "Endogeneity in pharmaceutical knowledge generation: An instrument‐free copula approach for Poisson frontier models" @default.
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- W4283581218 doi "https://doi.org/10.1111/jems.12491" @default.
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