In this way, the results of this paper further compliment the initial work that has been done on raw panel unit root tests. Panel methods in the spirit of this line of research can also be used to improve ones ability to make inferences about the specific rank or number of cointegrating relationships in panels with multiple regressors in the context of maximum likelihood based methods. REFERENCES Bernard, A. and C. Jones (1996) "Productivity Across Industries and Countries; Time Series Theory and Evidence," Review of Economic Statistics, 78, 135-146. Butler, A. and M. Dueker (1999) Does Foreign Innovation Affect Domestic Wage Inequality?