. 2019 Jul 9;12(13):2211. doi: 10.3390/ma12132211

Table 4.

Two-way analysis of variance for the downward surfaces.

Source	Degrees of Freedom	Sum of Square	Mean Square	F-ratio	P-value
Slope	6	175	29.2	4.67	0.000
Position	8	300	37.6	6.01	0.000
Interaction	48	520	10.8	1.17	0.008
Error	126	787	6.3
Total	188	1783
S	2.5	R-Sq	34.13%