Botanical Studies

Table 2 Significant tests for slopes of regression models with the same ETM extents

From: Sky-canopy border length, exposure and thresholding influence accuracy of hemispherical photography for complex plant canopies

Type of CHPs	ETM extent	DFW	DFB	F value	P value
Model CHPs	− 1	64	3	34.899	0.007
	+ 1	64	3	12.444	0.030
	+ 2	64	3	32.819	0.007
	+ 3	64	3	9.870	0.041
	+ 4	64	3	5.244	0.098
	− 1	134	2	5.099	0.178
Real CHPs	+ 1	134	2	9.742	0.097
	+ 2	134	2	2.087	0.380
	+ 3	134	2	0.561	0.828

These regression model are shown in Figs. 9 and 10
CHP canopy hemispherical photograph, DFW degree of freedom within groups, DFB degree of freedom between groups

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