Hello,
I cannot find a solution for this by myself: I have panel data, several waves with unique IDs and an ID that refers to the previous wave. So if I append wave 2 to wave 1, I have a common ID for both. But if I append wave 3, I only have a common ID for these two waves, and so on. My question is whether I can use ID_2, ID_3 and so forth to assign a value to ID_1 or whether I need to create a new identifier? It looks like this:
wave ID_1 ID_2 ID_3
1 1
1 2
1 3
2 1 x
2 2 y
2 3 z
3 x 1-1
3 y 2-1
3 z 3-1
Thank you in advance!
Andreas Knabe