if I have my data sorted in the form:
coloumn1 coloumn2 coloumn3 coloumn 4
variable series year1 year2
x 1
x 2
x 3
y 1
y 2
y 3
how can i convert this into this form:
coloumn1 coloumn2 coloumn3 coloumn4
series year x y
1 year1
1 year2
1 year3
2 year1
2 year2
2 year3
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