Inflection and stability points of diphasic logistic analysis of growth

  • Martha Maria Mischan São Paulo State University; /IBB − Dept. of Biostatistics; Universidade Estadual Paulista
  • José Raimundo de Souza Passos São Paulo State University; /IBB − Dept. of Biostatistics; Universidade Estadual Paulista
  • Sheila Zambello de Pinho São Paulo State University; /IBB − Dept. of Biostatistics; Universidade Estadual Paulista
  • Lídia Raquel de Carvalho São Paulo State University; /IBB − Dept. of Biostatistics; Universidade Estadual Paulista

Abstract

Growth functions with inflection points following a diphasic model, can be adjusted by two approaches using segmented regression or the sum of two functions. In both cases, there are two functions, one for each phase, with inflection and stability points. However, when they are summed, the result is a new function and the points of inflection and stability are different from those obtained from using each function individually. A method to determine these points in a diphasic logistics sum of functions is suggested and the results obtained from fitting the models to eucalyptus growth data showed a better fit of the logistic diphasic sum as compared with segmented regression and monophasic logistic models.

Downloads

Download data is not yet available.
Published
2015-06-01
How to Cite
Mischan, M., Passos, J., Pinho, S., & Carvalho, L. (2015). Inflection and stability points of diphasic logistic analysis of growth . Scientia Agricola, 72(3), 215-220. https://doi.org/10.1590/0103-9016-2014-0212
Section
Biometry, Modeling and Statistics