For both ways, could say something about how to create panel IDs? thanks!
In my experience with very large data the performance of proc transpose breaks down and becomes highly inefficient in which case data step with array subscript processing becomes more increasingly more efficeint, this is also more sensitive to the number of variables vs. the number of rows. With the number of variables you are dealing with, I have no experienced issues with transpose performance and usually for smaller sets the simplicity of the call outways the small performance difference I experience on my systems.
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