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Table 1 Unit root tests

From: A cointegrating stock trading strategy: application to listed tanker shipping companies

Variable ADF PP
Levels
  ln BTt −1.14 −0.95
  ln Pt −0.67 −0.66
First Differences:
 ln BTt −14.39*** −15.15***
 ln Pt −19.73*** −19.75***
  1. Notes: Δ is the first difference operator. Critical values are from MacKinnon (1996). *** denotes significance at the 1% level