SciELO - Scientific Electronic Library Online

 
vol.67 número2Efeito do pH e da temperatura nas atividades da peroxidase e polifenoloxidase do pericarpo de lichiaSeleção assistida por marcadores de linha mantenedora dentro de uma população de cebola tropical índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Scientia Agricola

versão On-line ISSN 1678-992X

Resumo

CARVALHO, Lídia Raquel de; PINHO, Sheila Zambello de  e  MISCHAN, Martha Maria. Methods to verify parameter equality in nonlinear regression models. Sci. agric. (Piracicaba, Braz.) [online]. 2010, vol.67, n.2, pp.218-222. ISSN 1678-992X.  https://doi.org/10.1590/S0103-90162010000200014.

In biologic experiments, in which growth curves are adjusted to sample data, treatments applied to the experimental material can affect the parameter estimates. In these cases the interest is to compare the growth functions, in order to distinguish treatments. Three methods that verify the equality of parameters in nonlinear regression models were compared: (i) developed by Carvalho in 1996, performing ANOVA on estimates of parameters of individual fits; (ii) suggested by Regazzi in 2003, using the likelihood ratio method; and (iii) constructing a pooled variance from individual variances. The parametric tests, F and Tukey, were employed when the parameter estimators were near to present the properties of linear model estimators, that is, unbiasedness, normal distribution and minimum variance. The first and second methods presented similar results, but the third method is simpler in calculations and uses all information contained in the original data.

Palavras-chave : logistic model; treatments comparison.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons