The purpose of this paper is to investigate the stochastic behavior of corporate debt ratios utilizing a balanced panel … of 2,556 publicly traded US firms during the period 1997 - 2010. We partition the panel into ten economic sectors and … perform panel unit root tests on each sector employing book value and market value measures of debt ratio. First …

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 …

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 …