This coefficient takes the value of 0
if the configurations are uncorrelated and the value of 1 if the
configurations are homothetic. It depends on the relative position of
the points in the configuration and therefore is independent of rotation
and translation (Robert & Escoufier, 1976). In this study the RV
coefficient was applied to measure the agreement between each
evaluation time. The MFA and RV coefficient were performed with
R language (R Development Core Team, 2007) using FactoMineR
(Lê, Josse, & Husson, 2008).