Hi everyone,

I have a Panel Data Set and want to create a variable which shows me the change of the individual responses between two (and more) variables. So the two variables are these ones:
1. a variable that shows how satisfied people are with the government, ranging from 0 (not very satisfied) to 1 (very satisfied). This variable was conducted on September 2013.
2. The second variable is the same, showing how satisfied people are with the government from 0 (not very satisfied) to 1 (very satisfied). This variable was conducted on December 2013.

So now I want to create a new variable which will calculate the change from the first to the second variable (for example, if one respondent answered the first question with 0 and the second question with 1, it is a change of one-->I want exactly this in a new variable). Unfortunately, I don't have a variable which shows the wave or a time-series variable. I tried a lot but it didn't work. Is there a way to calculate this in STATA (I'm working with Stata 15)?

Maybe someone knows a solution.
Thanks in advance