Quasi‐fixed Points w.r.t. the Height Growth Curve

When height growth curves are linearized, these lines are nearly concurrent after the growth spurt (Masuyama, 1979, 1982b, 1983), i.e. there exists a nearly fixed point, which seems to correspond to the upper limit of the growth of the mean person. On other hand, before the spurt, there seems to exist a nearly fixed point on the mean distance‐velocity curve between 4 and 6 years of age. To grasp easily the existence of nearly fixed point, instead of many straight lines surrounding this point, we represent them dually by many points surrounding a straight line.