Table 3.

Comparison of an existing image-analysis software DIRT to TIPS

Trait	DIRT	TIPS	p value
Tassel weight	0.89 (soil tissue angle 90% 1)	0.95	1.0 × 10−8*
Tassel length	0.71 (roots seg 2)	0.91	1.5 × 10−12*
Spike length	0.52 (soil tissue angle 50% 2)	0.85	1.3 × 10−6*
Branch number	0.86 (root top angle)	0.81	2.4 × 10−2

Correlations between hand-measured and image-based phenotypes for a random subset of 200 tassel images. ‘DIRT’ column represents highest correlation with traits output by DIRT (trait name as output by DIRT in parentheses). ‘TIPS’ column represents the correlation with the TIPS method designed for each trait. The higher correlation is Italicized. The p value column represents the result of a two-sided test for equivalence of dependent correlations [13]. p values that are significant at a Bonferroni-corrected threshold corresponding to α = 0.05 for four tests (1.25 × 10⁻²) are noted with an asterisk