By sector

Aggregated over the twelve common sectors. Any cell holding fewer than five companies is folded into "Other (suppressed)".

The denominator for every rate is the number of domains that could be observed, not the number of domains measured.

Why only twelve sectors

Published at the original 33 sectors, thinly populated ones such as air transport or marine transport come close to fewer than five companies, so no finer axis is published.

Suppression is applied in two steps. Folding cells with fewer than five companies is not enough on its own: if only one cell ends up folded, its value can be recovered by subtracting the published cells from the total. So when suppression would leave a single folded cell, the next smallest cell is folded with it.

Reading the sector axis

The sector classification maps into twelve classes through ISIC Rev.4. What it maps from depends on the population: EDINET's 33 sectors for Japan, SEC SIC codes for the US. Both are pulled to the same intermediate classification so the two countries can sit on one axis.

The mapping table is kept as configuration, so it stays possible to trace which primary sector went where.

Companies with no sector assigned are left out of the sector aggregation. Treating "sector unknown" as a sector of its own would distort the denominator. They remain in the overall statistics.