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The logistic curve fitted on a five-year average of these numbers is still in its very early stages, which makes the pattern so far indistinguishable from the exponential pattern mentioned earlier.

It is more reasonable to assume that they tend to grow along some variant of what mathematicians call a logistic curve, as illustrated in the graph below.

They prefer to fit data to variants of a “logistic” curve.

Dr. Pearl has constructed a "logistic" curve following the population rise of the past three centuries.

Among these subjects were the transit of Mercury, the Aurora Borealis, the figure of the earth, the observation of the fixed stars, the inequalities in terrestrial gravitation, the application of mathematics to the theory of the telescope, the limits of certainty in astronomical observations, the solid of greatest attraction, the cycloid, the logistic curve, the theory of comets, the tides, the law of continuity, the double refraction micrometer, various problems of spherical trigonometry, &c.