ADF test results are nonstationary with constant and trend term

[Fareeha manzoor]

HI everyone, I have run the ADF unit root test for my variable "log_CO2" and the result shows that it is stationary with constant term at both lags (0 and 1) but it becomes nonstationary when I include the trend term with constant. the same is the result of Philips perron test. kindly help me to solve the problem.
the results are given..

[Sartaj Hussain]

It seems that the variable is trend stationary. To detrend, apply OLS regression on your variable with a constant and time as dependent variable. Take the residuals of the regression, they will be stationary at level.

[Fareeha manzoor]

ok i will try this.. but it becomes nonstationary when i include the trend. thank you for your answer

[Sartaj Hussain]

You have to remove the trend which is called detrending. .

[Fareeha manzoor]

ok
thanks for answering..