Horváth, Lajos; Kokoszka, Piotr; Zitikis, Ricardas - In: Journal of Financial Econometrics 4 (2006) 4, pp. 617-635
The unconditional variance of various GARCH-type models is a function h(theta) of the parameter vector theta which is estimated by theta. For most models used in practice, closed-form expressions of h(.) have been found. On the contrary, the unconditional variance can be estimated by the sample...