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Table 1.

Cross-validation (root mean square error) on the quantile regression analysis for the body of the distribution

Model structure for ${\hat{q}}_{o}^{(τ)} (t, s)$	ST-CV	15-CV
$β_{0}^{(τ)}$	$1.442$	$1.455$
$β_{0}^{(τ)} + β_{1}^{(τ)} q_{c}^{(τ)} (s)$	$1.350$	$1.347$
$β_{0}^{(τ)} + β_{1}^{(τ)} q_{c}^{(τ)} (s) + β_{2}^{(τ)} M^{I} (t)$	$1.322$	$1.319$

Note. The smallest values in each case are highlighted in bold.