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Instantaneous maturity rate: a novel and compact characterization of biological growth curve models

Abstract

Modeling and analysis of biological growth curves are an age-old study area in which much effort has been dedicated to developing new growth equations. Recent efforts focus on identifying the correct model from a large number of equations. The relative growth rate (RGR), developed by Fisher (1921), has largely been used in the statistical inference of biological growth curve models. It is convenient to express growth equations using RGR, where RGR can be expressed as functions of size or time. Even though RGR is model invariant, it has limitations when it comes to identifying actual growth patterns. By proposing interval-specific rate parameters (ISRPs), Pal et al. (2018) appeared to solve this problem. The ISRP is based on the mathematical structure of the growth equations. Therefore, it is not model invariant. The current effort is to develop a measure of growth that is model invariant like RGR and shares the advantages of ISRP. We propose a new measure of growth, which we call instantaneous maturity rate (IMR). IMR is model invariant, which allows it to distinguish growth patterns more clearly than RGR. IMR is also scale-invariant and can take several forms including increasing, decreasing, constant, sigmoidal, bell-shaped, and bathtub. A wide range of possible IMR shapes makes it possible to identify different growth curves. The estimation procedure of IMR under a stochastic setup has been developed. Statistical properties of empirical IMR estimators have also been investigated in detail. In addition to extensive simulation studies, real data sets have been analyzed to prove the utility of IMR.

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Acknowledgements

We express our sincere gratitude to the Editor-in-Chief Prof. Sonya Bahar and the anonymous reviewer for their valuable comments which immensely improved the manuscript. We are thankful to Prof. Aditya Chattopadhyay, Calcutta University, for his valuable suggestions and motivation for the paper. We wish to thank our respective organizations, institutions, and universities for giving us the necessary logistic support.

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Correspondence to Sabyasachi Bhattacharya.

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Chakraborty, B., Bhowmick, A.R., Chattopadhyay, J. et al. Instantaneous maturity rate: a novel and compact characterization of biological growth curve models. J Biol Phys (2022). https://doi.org/10.1007/s10867-022-09609-9

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  • DOI: https://doi.org/10.1007/s10867-022-09609-9

Keywords

  • Relative growth rate
  • Identification of growth curves
  • Characterization of growth curves
  • Model selection