Modelling thresholds and volatility in US ecological patents
Ecological patents have been increasing steadily over time. This paper analyses trends and volatility in ecological patents in the USA from 1975 to 1997. Germany contributed more than 10% of the total US ecological patents, and is by far the strongest foreign performer. This paper estimates a set of...
| Main Authors: | , , |
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| Format: | Journal Article |
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Elsevier SCI Ltd
2005
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| Online Access: | http://hdl.handle.net/20.500.11937/3159 |
| _version_ | 1848744155090518016 |
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| author | Chan, Felix Marinova, Dora Mcaleer, M. |
| author_facet | Chan, Felix Marinova, Dora Mcaleer, M. |
| author_sort | Chan, Felix |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Ecological patents have been increasing steadily over time. This paper analyses trends and volatility in ecological patents in the USA from 1975 to 1997. Germany contributed more than 10% of the total US ecological patents, and is by far the strongest foreign performer. This paper estimates a set of novel regime-switching models to investigate the time-varying nature of the conditional mean, as well as the conditional variance of the patent ratio, namely the ratio of US ecological patents to total US patents, using monthly data from January 1975 to December 1997. The regime-switching LSTAR-GARCH model is found to be optimal for modelling the ecological patent ratio. |
| first_indexed | 2025-11-14T05:56:58Z |
| format | Journal Article |
| id | curtin-20.500.11937-3159 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T05:56:58Z |
| publishDate | 2005 |
| publisher | Elsevier SCI Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-31592017-09-13T14:31:37Z Modelling thresholds and volatility in US ecological patents Chan, Felix Marinova, Dora Mcaleer, M. STAR-GARCH GARCH STAR-GJR GJR Regime-switching Ecological patents Asymmetry Trends Volatility Ecological patents have been increasing steadily over time. This paper analyses trends and volatility in ecological patents in the USA from 1975 to 1997. Germany contributed more than 10% of the total US ecological patents, and is by far the strongest foreign performer. This paper estimates a set of novel regime-switching models to investigate the time-varying nature of the conditional mean, as well as the conditional variance of the patent ratio, namely the ratio of US ecological patents to total US patents, using monthly data from January 1975 to December 1997. The regime-switching LSTAR-GARCH model is found to be optimal for modelling the ecological patent ratio. 2005 Journal Article http://hdl.handle.net/20.500.11937/3159 10.1016/j.envsoft.2004.09.017 Elsevier SCI Ltd restricted |
| spellingShingle | STAR-GARCH GARCH STAR-GJR GJR Regime-switching Ecological patents Asymmetry Trends Volatility Chan, Felix Marinova, Dora Mcaleer, M. Modelling thresholds and volatility in US ecological patents |
| title | Modelling thresholds and volatility in US ecological patents |
| title_full | Modelling thresholds and volatility in US ecological patents |
| title_fullStr | Modelling thresholds and volatility in US ecological patents |
| title_full_unstemmed | Modelling thresholds and volatility in US ecological patents |
| title_short | Modelling thresholds and volatility in US ecological patents |
| title_sort | modelling thresholds and volatility in us ecological patents |
| topic | STAR-GARCH GARCH STAR-GJR GJR Regime-switching Ecological patents Asymmetry Trends Volatility |
| url | http://hdl.handle.net/20.500.11937/3159 |