Methodology
Definitions
Volume = unique canonical venue locations whose menu collection is attempted, including unsuccessful attempts. Discovered candidates, successful inspections and usable menus are reported separately.
Prevalence
'Most commonly offered' = distinct inspected venues with an evidenced item ÷ eligible venues with usable menus in scope. Denominator always shown.
Price statistics
Min, Q1, median, Q3, max with sample and distinct-venue counts. Default statistic uses one median comparable price per venue; item-weighted results are also available and labelled.
Quantiles
One documented convention across dashboard, PDF and XLSX (inclusive linear interpolation). Comparative conclusions suppressed below five distinct venues.
Change detection
Matched within venue, channel, dish/variant, size and menu type. Absence from a failed refresh is never treated as item removal.
Evidence
Every reportable observation carries a source URL, timestamp and evidence locator. Retrieval date is distinguished from menu publication date.