what does lag difference mean in dickey fuller test what is the lag difference of dickey fuller is the dickey fuller variable non stationary is tfr stationary if the coefficient is negative, the model will be invalid if tfr is stationary is what is the difference between trend and intercept when there is no trend and a dickey fuller model? what does adf mean in statistics dickey test lag value what is the intercept of dickey-fuller test if there is a lag difference, does the model still have the lag which variable is stationary and has no trend what is the lag difference in dickey fuller when the coefficient is negative does the model valid which variable is also non-stationary if the coefficient is negative does the model of tfr become invalid? when i test an adf on tfr what does the coefficient mean when the coefficient of l1 is not negative is the model what does lag difference mean in the adjusted dickey partial test what does the model of tfr mean