Only what was published before the release
Every published CGPI figure is kept in a point-in-time archive the day it is published, and later corrections are added beside it, never over it. Each row replays the archive as of the day before Statistics Canada's release. If our published series did not cover both months that day, the row uses the last earlier date that did. Snapshots stamped when the archive began, rather than when they were published, are never used.
Our monthly reading
A week counts toward the month its Thursday collection falls in. The reading is the change in the average of the month's weekly national index values from the previous month's average. The later month must be complete, and each month needs at least two weeks.
Statistics Canada's figure
Consumer Price Index, food purchased from stores, Canada, not seasonally adjusted (table 18-10-0004-01), and its fresh fruit, fresh vegetables, meat, dairy and eggs, and bakery and cereal groups. Changes are computed from the published index levels and rounded to one decimal, as Statistics Canada does.
Direction
Both changes are compared after rounding to one decimal. A month where either side rounds to 0.0 is shown as flat and not counted either way.