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Unconstrained models provide a greater generality of the paths allowing for nonlinearities in the volatility. Cyclical behaviour is permitted as well as different relative impacts of positive and negative shocks on volatility, depending on their size. We give empirical evidence using French stock returns.<\/jats:p>","DOI":"10.1002\/jae.3950080104","type":"journal-article","created":{"date-parts":[[2007,7,12]],"date-time":"2007-07-12T16:53:54Z","timestamp":1184259234000},"page":"31-49","source":"Crossref","is-referenced-by-count":307,"title":["Threshold arch models and asymmetries in volatility"],"prefix":"10.1002","volume":"8","author":[{"given":"R.","family":"Rabemananjara","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. 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