This paper overviews some recent developments in nonstationary panel data asymptotics, concentrating on the nonstationary panel case and gives a new result for models with individual effects. Underlying recent theory are asymptotics for multi-indexed processes in which both indexes may pass to...

This Paper Proposes Some New Tests for Detecting the Presence of a Unit Root in Quite General Time Series Modesl. Our Approach Is Nonparametric with Respect to Nuisance Parameters and Thereby Allows for a Very Wide Class of Weakly Dependent and Possibly Heterogeneously Distributed Data. the...

Stock and Watson (1986) Tests the Hypothesis That Real Per Capita Gnp Has a Unit Root by Using a Test Statistic Due to Phillips (1985) Which Incorporates a Nonparametric Correction for the Serial Correlation Induced by System and Error Dynamics. the Version of This Test That Is Used by Stock and...