logistic curve

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logistic curve

[lə′jis·tik ′kərv]
(statistics)
A type of growth curve, representing the size of a population y as a function of time t : y = k/ (1 + e -kbt ), where k and b are positive constants. Also known as Pearl-Reed curve.
More generally, a curve representing a function of the form y = k/ (1 + e cf (t)), where c is a constant and ƒ(t) is some function of time.
References in periodicals archive ?
Sigmoid (S) shaped or logistic curves predict the carrying capacity which is the population that is sustainable in an environment.
Furthermore, the logistic curves all show a relatively flat peak, with a pronounced "hang time" near the peak.
Using statistical methods to choose the logistic curve that best fits the oil data yields 2014 as the year of peak oil production.
Table 1 shows parameter values of logistic curves fitted to derived h prior distributions as natural mortality (M) ranged from 0.
Using an estimated split model (Millar and Walsh, 1992), we fitted logistic curves to these data by maximum likelihood method (Pope et al.