how to test a variable in excel which method is the best to test for integrated order 2/ nonstationary i(2) how to test for integrated order 2/non-stationary how to test integration how do i test for integrated order when testing for integrated order 2/non-stationary i(2), how to apply the augmented dickey-fuller test how to test in integrated order 2/non-stationary i(2)? how to test if a variable i(2) is $i(2) test whether a variable is $i(2) instead of $i(1) how to test integrated order 2 in r how to test for integrated order 2/non-stationary i(2) what test do i use for the integrated order how to test integrated order 2/nonstationary what is the method used to test for an integrated order in javascript how to test for integrated order 2/nonstationary i(2) how to test integrated order dickey-fuller test dickey fulller test which function is used to test for integrated order 2/nonstationary i(2) what test determines the null value for xt