Market volatility
How much products on page 1 jump between two captures, on average. Higher means a more turbulent market.
The same calculation as Volatility, but for all products together: the average jump between two consecutive captures, across every product that was on page 1 at least once of the two, for your active keywords. Products entering or leaving page 1 count too. A calm market rewards steady work. In a volatile one, rankings shift quickly and a good position needs more defending. The change compares it with the previous period of the same length.