F Dubeau

Y Mir

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Growth models with oblique asymptote
F. Dubeau and Y. Mir
Département de mathématiques
Université de Sherbrooke
2500 Boulevard de l’Université
Sherbrooke (Qc), Canada, J1K 2R1
francois.dubeau@usherbrooke.ca
youness.mir@usherbrooke.ca
Paper published in Mathematical Modelling and Analysis, 18 (2013), 204-218.
Keywords : Growth models, Exponential, Gompertz, Logistic, Richards, Bridge, Michaelis-
Menten, oblique asymptote, single inflection point.
AMS Subject Classification : 26A48, 65D10, 62J02.
Summary
Growth functions with horizontal asymptotes as Gompertz, Logistic, Richards (generalized Lo-
gistic), Bridge or Michaelis-Menten are commonly and widely used in various fields, e.g., agriculture
[8, 9, 10, 11, 14], biology [7, 15, 16, 26, 27], economy [22], engineering [21], fishery [24], forestry
[18, 29, 30], hydrology [1, 2, 4, 5, 6, 12, 17, 28], medicine [13], and other areas of applied research
[19, 20, 23]. These growth functions are characterized by an horizontal asymptote and a single
inflection point [3]. In some applications it could be usefull to have growth functions with one in-
flection point and an oblique asymptote. In this paper we extend our previous study [3] and modify
the already mentioned models in such a way to obtain an oblique asymptote in keeping the single
inflection point property. The structure of the present paper is as follows. In Section 2 we start
with a general study of our modified model and introduce some elementary properties which are
used in Section 3. In this section we modify some growth functions having a horizontal asymptote
to obtain a model having an increasing linear asymptote. Finally in Section 4 we present some
numerical examples on synthetic data.
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Growth models with oblique asymptote

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Growth models with oblique asymptote

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