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The timber volume calculated from the yield table in N-FAC overestimated or underestimated the timber volume by as much as 30% compared to the value obtained from the tree volume table. We could examine the extent of overestimation or underestimation from the yield ratio. N-FAC is more excellent than Japan verified emission reduction (J-VER) with respect to several points. First, in N-FAC, stand age is confirmed by field investigation, whereas in J-VER, stand age is determined only by stand description, which often describes trees as older than they actually are. Second, in N-FAC, the site index is determined from the average height of the stand, whereas in J-VER, it is determined from the average height of dominant trees, leading to the overestimation of timber volume at the stand level. N-FAC misuses the yield table, leading to overestimation or underestimation of the timber volume when the yield ratio departs from 0.7 to 0.8. 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