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Yes, variables are not stationary, i'll start by doing that. I'm not familiar with the ARMAX time series. I'm conducting research for an executive master thesis, just for you to know that i'm not actually a "black belt in statistics" :) sorry for that. Why is Autoregressive Moving Average...

Thanks for your reply. What do you mean? I want to assess to what extent are the variables influenced by the interest rate changes? Is there any significant statistical relationship between them? I'm not sure, i'm a bit lost actually.

HI, I'm struggling to find out which statistical test is most appropriate to analyze the impact of negative interest rates on profitability; Data collected: Sample - 30 Banks Yearly data for each variable from year end 2007 to year end 2017 - 10 years Variables I'm considering are...