This paper argues that typical applications of panel unit root tests should take possible nonstationarity in the … volatility process of the innovations of the panel time series into account. Nonstationarity volatility arises for instance when … enjoyed by many industrialized countries, known as the `Great Moderation.' It also proposes a new testing approach for panel …

aggregate health-care price inflation rate series, using the data on health-care inflation rates for a panel of 17 major US …-generation panel unit root tests and the panel stationary test developed recently by Carrion-i-Silvestre et al. (2005) that allows for … bias, and asymptotic normality, the US aggregate health-care price inflation rate series can be characterized as a non …

aggregate health-care price inflation rate series, using the data on health-care inflation rates for a panel of 17 major US … generation panel unit root tests and the panel stationary test developed recently by Carrion-i Silvestre et al. (2005) that …, finite sample bias, and asymptotic normality, the US aggregate health-care price inflation rate series can be characterized …