Table 2.

Summary of the compressed mixed linear model analysis for three traits related to resistance to MCB attack and three agronomic traits in an inbred association panel evaluated in three years

Trait	n a	s b	Compression Level ( c ) c	$\left({\widehat{\mathbf{\sigma }}}_{\mathbf{g}}^{\mathbf{2}}\right)$ d	$\left({\widehat{\mathbf{\sigma }}}^{\mathbf{2}}\right)$ e	$\left(\frac{{\widehat{\mathbf{\sigma }}}_{\mathbf{g}}^{\mathbf{2}}}{{\widehat{\mathbf{\sigma }}}_{\mathbf{g}}^{\mathbf{2}}\mathbf{+}{\widehat{\mathbf{\sigma }}}^{\mathbf{2}}}\right)$ f
TL	267	32	8.34	32.80	50.61	0.39
SD	267	201	1.33	1.45	9.51	0.13
KR	265	166	1.60	0.15	0.16	0.48
PH	266	192	1.39	384.70	256.56	0.60
DTA	266	240	1.11	45.03	5.03	0.94
DTS	266	240	1.11	51.19	5.87	0.90

TL, tunnel length; SD, stem damage; KR, borer kernel resistance; PH, plant height; DTA, days to anthesis; DTS, days to silking.

^a Total number of inbred lines included in the analysis.

^b Number of groups obtained using a clustering approach based on K matrix with the optimum compression level option.

^c Compression level is the average number of inbred lines per group estimated as n/s.

^d Additive background genetic variance component estimated in Tassel by fitting the K matrix in the MLM without any SNP marker effects.

^e Residual genotypic variance component estimated in Tassel.

^f Proportion of phenotypic variance explained by the K matrix, estimated as background genetic variance divided by total phenotypic variance.