Patent keyword analysis using time series and copula models

Jong Min Kim, Jaeeun Yoon, Sun Young Hwang, Sunghae Jun

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The technological keywords extracted from patent documents have much information about a developed technology. We can understand the technological structure of a product by examining the results of patent analysis. So far, much research has been done on patent data analysis. The technological keywords of patent documents contain representative information on the developed technology. As such, the patent keyword is one of the most important factors in patent data analysis. In this paper, we propose a patent data analysis model combining a integer valued time series model and copula direction dependence for integer valued patent keyword analysis over time. Most patent keywords are frequency values and keywords often change over time. However, the existing patent keywords analysis works do not account for two major factors: integer value and time. For modeling integer valued keyword data with time factor, we use a copula directional dependence model based on marginal regression with a beta logit function and integer valued generalized autoregressive conditional heteroskedasticity model. Using the proposed model, we find technological trends and relations in the target technological domain. To illustrate the performance and implication of our paper, we carry out experiments using the patent documents applied and registered by Apple company. This study contributes to the effective planning for the research and development of technologies by utilizing the evolution of technology over time.

Original languageEnglish (US)
Article number4071
JournalApplied Sciences (Switzerland)
Issue number19
StatePublished - Oct 1 2019

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education(NRF-2017R1D1A3B03031152).

Publisher Copyright:
© 2019 by the authors.


  • Beta logit model
  • Copula directional dependence
  • Integer-valued time series model
  • Patent analysis
  • Patent big data


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