SPSS compute cases in different variables

Question

I am currently using SPSS to process my data. eg. I have data like

V1 V2 V3

258 235

236 567

123 987

576 234

678 456

for the values of V3, I wanna compute the case of V1 minus the former case of V2 they are 236-235, 123-567, 576-987, 678-234

Because I have more than one million data , and I wanna do a loop compute

so how should I write in Syntax? Thank you!

Answer 1

Statistics automatically loops over the cases. You just need to write the compute statement. If you meant the previous case by "former case of V2", see the LAG function.