Univariate and multivariate nonlinear models in productive traits of the sunn hemp

Resumo

Multivariate analysis helps to understand the relationships between dependent variables; this methodology
has great potential in several areas of knowledge. The aim of this study was to adjust and compare the univariate and
multivariate Gompertz and Logistic nonlinear models to describe the productive traits of sunn hemp (Crotalaria juncea L.).
Two uniformity trials were performed, and the following productive traits were analyzed in 376 sunn hemp plants along 94
days of observations (four plants per day): the fresh mass of leaves (FML), the fresh mass of stem (FMS), and the fresh mass
of the aerial parts (FMAP). The Gompertz and Logistic univariate models were adjusted for each productive trait. To adjust
the multivariate models, the errors covariance matrix was calculated. The matrix (Cholesky factor) was obtained for each
trait, and the multivariate Gompertz (GG) and Logistic (LL) nonlinear models were generated, together with the combination
of both models (GL and LG). To define the best model, the residual standard deviation (RSD), the determination coefficient
(R2
), the Akaike information criterion (AIC), the mean absolute deviation (MAD), and the measures of intrinsic nonlinearity
(INL) and parametric nonlinearity (PNL) were calculated. The nonlinear multivariate model LL was adequate and achieved
satisfactory results to describe the productive traits of sunn hemp.