Which sets are up most
Every set that has enough priced history to carry its own index, ranked by how that index has moved. Singles and sealed are separate — opening boxes adds singles to the supply and removes sealed from it, so within one set the two routinely pull apart, which is the whole reason to track them apart.
Ranked by change, never by index level: each set is rebased to 100 at its own first measurable week, so levels describe different spans and cannot be compared across sets. A window is blank where the set has no index reaching that far back.
A set appears once its index clears 5 matched products in a week — a set with fewer priced sealed SKUs than that has no line rather than a thin one. Built with the same matched-sample construction as the market index, from TCGplayer prices. How this is built.