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An empirical test of the asymmetric models on innovative activity : who invests more into R&D - the incumbent or the challenger?
Czarnitzki, Dirk; Kraft, Kornelius - 2000
challenger invests more into R&D in order to enter a new market than the incumbent. Thus, the patent racing model by Reinganum …
Persistent link: https://www.econbiz.de/10011444512
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Zähldatenmodelle (Count data models) : Ansätze und Anwendungen
Dexheimer, Verena - 2002
takes only nonnegative integer values. The specification of the Poisson- and the NegBin 2-Model with their estimation … tests for overdispersed data are used. The strong positive relationship between patent applications and the R&D personnel …
Persistent link: https://www.econbiz.de/10010489365
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An empirical test of the asymmetric models on innovative activity : who invests more into R&D, the incumbent or the challenger?
Czarnitzki, Dirk; Kraft, Kornelius - In: Journal of economic behavior & organization : JEBO 54 (2004) 2, pp. 153-173
Persistent link: https://www.econbiz.de/10002073150
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Flexible parametric models for long-tailed patent count distributions
Guo, Jie Q.; Trivedi, Pravin - In: Oxford bulletin of economics and statistics 64 (2002) 1, pp. 63-82
Persistent link: https://www.econbiz.de/10001659536
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Constructuring instruments for regressions with measurement error when no additional data are available, with an application to patents and R&D
Lewbel, Arthur - In: Econometrica : journal of the Econometric Society, an … 65 (1997) 5, pp. 1201-1213
Persistent link: https://www.econbiz.de/10001225111
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Research and development, competition and innovation : pseudo-maximum likelihood and simulated maximum likelihood methods applied to count data models with heterogeneity
Crépon, Bruno - In: Journal of econometrics 79 (1997) 2, pp. 355-378
Persistent link: https://www.econbiz.de/10001335918
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Zähldatenmodelle : Ansätze und Anwendungen
Dexheimer, Verena - 2002
Persistent link: https://www.econbiz.de/10001679737
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Flexible Parametric Models for Long-Tailed Patent Count Distributions
Trivedi, Pravin K.; Guo, Jie Qun - 2015
and development expenditure. Patent counts typically exhibit long upper tails that are inadequately mod-eled by standard … with two exible parametric approaches in analyzing two patent data sets …
Persistent link: https://www.econbiz.de/10014119315