I'm currently doing a study about the s/t and l/t relationship between the sin taxes ( alcohol + tobacco ) and the generic tax collection ( do they move in the same way? do they depend on each other? ). I have national tax collection data from January 1995 on until now but when I try to insert the data panel in R it fails for all kinds of studies I try to make.

At first I tried to do a fixed-time effects model regression model but it failed. Now I'm doing a cointegration&causality model but not getting the "tic" that it is the right model to use.

Any suggestion on what econometric model to use? Does this research make sense?

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