The results hold in stationary CARR model, CARR model with a unit root and other nonstationary processes which satisfy certain conditions and provide a theoretical basis for statistical inference.

• 所得到的结论适用于已得到应用的平稳条件自回归极差模型，也适用于包含单位根的模型和满足条件的其他类型的非平稳过程，为模型的统计推断提供了理论基础。