i do research for my final term paper about how digital trade impact on carbon emission using panel ardl (PMG,MG,DFE), N=13 T=19, but one of my control variables on 2 countries cannot be found in every sources of data, so the data is unbalanced panel. if i do the linear interpolation, it such like a wrong decisions, cause the missing values is on the 5 first year (2005-2009) and the another country is 7 last year (2015-2023). first, i want to check the cross-sectional dependences (it's ok if the data is unbalance), second, i want to do the stationarity test using xtcips, in this part i can't do for this variable cause my data is unbalance. any recommendation for me, what should i use for stationarity test for my unbalance variable? (tbh i have not done yet for trying the PMG,MG,DFE in unbalanced panel, so if there is any recommendation for this one too, i would be so grateful)
thank u so muchhh
thank u so muchhh
