Table 3 Results of analysis of variance of various pre-processing steps on the segmented root length for two soil background materials (DF degrees of freedom)
From: Hyperspectral imaging: a novel approach for plant root phenotyping
Source | DF | F-value | p value |
|---|---|---|---|
Soil | 1 | 0.48 | 0.4978 |
Pre-treatment (Pre) | 8 | 1.98 | 0.1088 |
Dimensionality reduction (Dim) | 3 | 10.51 | 0.0003 |
Segmentation (Seg) | 3 | 8.01 | 0.0013 |
Soil × Pre | 9 | 6.42 | 0.0005 |
Soil × Dim | 3 | 1.16 | 0.3532 |
Soil × Seg | 3 | 2.51 | 0.0913 |
Pre × Dim | 24 | 3.34 | 0.0055 |
Pre × Seg | 24 | 5.83 | 0.0002 |
Dim ×  × Seg | 4 | 1.47 | 0.2514 |
Soil × Pre × Dim | 18 | 1.30 | 0.2940 |
Soil × Pre × Seg | 19 | 4.24 | 0.0017 |
Pre × Dim × Seg | 27 | 1.30 | 0.2826 |
Skewness | 1 | 12.15 | 0.0026 |