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Table 1 Unit Root Test

From: The relationship between energy consumption, economic growth and carbon dioxide emissions in Pakistan

 ADFPhillips-Perron
Level
VariablesInterceptTrend & InterceptInterceptTrend & Intercept
Co2 Per Capita−0.0105−3.9313**− 0.1172−2.3169
Per Capita % Of GDP−6.6133*−6.6682*− 6.6134*−6.6690*
Coal Consumption−0.4811−1.8007−0.2819− 2.5639
Natural Gas Consumption0.2805−1.91880.7109−1.6321
Oil Consumption1.0150−2.03561.2493−1.6065
First Difference
Co2 Per Capita−6.6240*− 6.5945*− 6.6824*− 6.6536*
Per Capita % Of GDP− 6.6240*−11.3836*− 6.6824*− 26.4811*
Coal Consumption− 3.9032**− 4.4879**− 7.0700*−7.1254*
Natural Gas Consumption− 3.5880**− 3.7317**− 3.5408*−3.6997**
Oil Consumption−3.5999**−4.0415**− 4.0651**− 4.7010**
  1. 1, 5 and 10% levels is indicated respectively by *, ** and ***