Table 1.

Friedman’s test $MS{E}^{\left(i\right)}$ and ${\overline{R}}^2{}^{\left(i\right)}$.

		${\mathit{MSE}}^{\left(\mathit{i}\right)}$			${\overline{\mathit{R}}}^2\left(\mathit{i}\right)$
Filter	N	${\chi }^{\mathbf{2}}$	df	Sig.	${\chi }^{\mathbf{2}}$	df	Sig.
none	352	395.21	2	0.000	313.20	2	0.000
quartile = 1	228	89.40	2	0.000	55.50	2	0.000
quartile = 2	261	96.07	2	0.000	67.75	2	0.000
quartile = 3	276	105.80	2	0.000	100.78	2	0.000
quartile = 4	297	106.95	2	0.000	96.89	2	0.000