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 ?
The gear selection model based on the logistic curve is believed versatile enough to describe the selection curve of any gear (Sparre and Venema, 1998).
iL] for all carapace width classes was summarized by parametric functionf(Wc;[theta]) using the inverse logistic curve which is the most commonly used among other sigmoid shapes (Holst, 2007) Equation 1:
The logistic curve fitted to samples taken during the summer of 2011, the year in which the winter survey occurred, was intermediate between the curves from the winter where fish that would skip spawning were classified as mature and the curve where fish that would skip spawning were classified as immature, and the fit was dissimilar to both, especially at moderate ages (Fig.
It is a common outcome on the transformers' health index, whose health conditions are good or very good because the initial stage of logistic curve is tending to zero.
Using statistical methods to choose the logistic curve that best fits the oil data yields 2014 as the year of peak oil production.
Another reason for considering a logistic curve follows from a rather subtle pattern in the data.
The dynamics of staminate flowering captured in the logistic curves for BegShed, MaxShed, and EndShed were used to create a Population Index ([P.
The parameter n is close to 1 corresponding to the logistic curve.
A 'Generalization' of the logistic curves and long-range forecasts (1966-1991) of residence telephones.
Table 1 Parameter values of logistic curves fitted to derived h prior distributions for different natural mortality (M) and recruitment variability ((T).
The logistic curves derived from gonadal data in each of the four southern bodies of water were significantly different (P>0.
Table 4 Computed selectivity parameters for prawns (carapace length in mm) from the two new trawl bodies and deviance values for the goodness-of-fit logistic curve.