Avg Premium % — on days when a retailer is not the cheapest, how much more expensive they usually are vs the daily market minimum.
% Time Cheapest — share of product-days where the retailer is at/within 1% of the best price.
% Days With Sale — on observed days, how often they have any genuine discount running.
Typical Sale % — typical discount depth when something is actually on sale.
Typical Sale Duration — median length of discount episodes (days).
Median Δ Days — typical days between price changes.
Pricing Integrity — composite 0–100 score based on fair reference prices, stability (no wild whipsaws), yo-yo avoidance, and overall value.