I found many cases in kaggle to predict the quantity or trends. They all set the real quantity as y.
But I have question is that does anyone set the changing ratio as y? Like: X y Day1 0.2 Day2 0.1 Day3 0.15 Day4 -0.1 y is the changing ratio compared with previous day. Why anybody set the real quantity(ex: sales, car numbers...etc) as y rather than changing ratio as y? I want to know it's based on experience or other reasons thx
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