Determination of optimal number of independent components in yield traits in rice

ABSTRACT: The principal component regression (PCR) and the independent component regression (ICR) are dimensionality reduction methods and extremely important in genomic prediction. These methods require the choice of the number of components to be inserted into the model. For PCR, there are formal criteria; however, for ICR, the adopted criterion chooses the number of independent components (ICs) associated to greater accuracy and requires high computational time. In this study, seven criteria based on the number of principal components (PCs) and methods of variable selection to guide this choice in ICR are proposed and evaluated in simulated and real data. For both datasets, the most efficient criterion and that drastically reduced computational time determined that the number of ICs should be equal to the number of PCs to reach a higher accuracy value. In addition, the criteria did not recover the simulated heritability and generated biased genomic values.

Bibliographic Details

Main Authors:	da Costa,Jaquicele Aparecida, Azevedo,Camila Ferreira, Nascimento,Moysés, Silva,Fabyano Fonseca e, de Resende,Marcos Deon Vilela, Nascimento,Ana Carolina Campana
Format:	Digital revista
Language:	English
Published:	Escola Superior de Agricultura "Luiz de Queiroz" 2022
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000600501
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