How can I go from this: a1 b1 c1 z1 a2 b2 c2 z2 a3 b3 c3 z3 to this: a1 b1 c1 z2 a2 b2 c2 z3 a3 b3 c3 z4 without lagging the a, b, and c variables? Is there a way to pull back the z variable? The reason I'd like to avoid this is because I've got many variables of the a, b, and c type that I don't want to mess with / rename, and only one like the z variable that I'd like to move back to the preceding observation. Thanks.
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