Changes in the Unconditional Variance and Autoregressive Conditional Heteroscedasticity


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Authors

  • Amado Peiró Universitat de València Spain

Abstract

This paper argues that a simple white noise process with one jump in its unconditional variance may give rise to the presence of ARCH effects, and, surprisingly, this may occur in determinate circumstances even when the jump is very brief. Though ARCH effects are not denied, this evidence, together with some empirical results obtained from Standard & Poor's 500 returns, allows one to question whether they are a general and regular property of so many economic and financial series.Keywords: ARCH, autoregressive conditional heteroscedasticity, stock returns, unconditional varianceJEL Classification: G12

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Author Biography

Amado Peiró, Universitat de València Spain

Departament d'Anàlisi EconòmicaUniversitat de València Full Professor

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Published

2016-10-21

How to Cite

Peiró, A. (2016). Changes in the Unconditional Variance and Autoregressive Conditional Heteroscedasticity. International Journal of Economics and Financial Issues, 6(4), 1338–1343. Retrieved from https://econjournals.com/index.php/ijefi/article/view/2643

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