I have the following structure for my panel data.
"country" are panelists observed over x balanced time units. The nominal variables fit/rps/tender/taxinc show a value other than 0 if an option is true. It also shows a certain value (in this case: 1 for Solar, 2 for Wind, 3 for Biomass etc.).
However, a country can also introduce a policy (fit/rps/tender/taxinc) for multiple technologies (f.e. solar and wind) the same year.
Should I create a separate variable for each technology or is there a more elegant way to do this?
Software for Analysis should be SPSS.
Thank you for your help.