Trends and Volatilities in Heterogeneous Patent Quality in Taiwan


  • Wen-Cheng Lu National Central University
  • Jong-Rong Chen National Central University
  • I-Hsuan Tung National Central University



patent trends, quality patents, Taiwan.


This study analyzes patent trends and volatilities for three heterogeneous quality patents in the Taiwan patent system from January 1973 to June 2006. The estimated models are symmetric GARCH and asymmetric EGARCH, providing full sample, rolling sample, and out-of-sample evidence. Three different patent types exhibit increasing trends, using monthly time series data from our samples. ”New design” patents also show time-varying volatility but other types of patents fail to reject the ARCH LM test. Findings show the asymmetric EGARCH model suitable for “new design” patent type through out of sample forecasts.


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Author Biographies

Wen-Cheng Lu, National Central University

Department of Economics

Jong-Rong Chen, National Central University

National Central University

I-Hsuan Tung, National Central University

National Central University


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How to Cite

Lu, W.-C., Chen, J.-R., & Tung, I.-H. (2009). Trends and Volatilities in Heterogeneous Patent Quality in Taiwan. Journal of Technology Management & Innovation, 4(2), 69–81.



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