Influence of Gap Size and Position within Gaps on Light Levels

Table 2

Results of the polynomial models for both methods (hemispherical photographs and instantaneous measurements) and for each gap size (small, medium, and large). For each model, the estimation of coefficients and their relative probability, 𝑅², and the position of maximum light are presented.

Method	Gap size	Intercept	Position	Position^2	Position^3	𝑅^2	Maximum
Hemispherical photographs	Small	16.57	−17.47	77.07	−47.37	0.63	0.96
		𝑃<.0001	𝑃=.1926	𝑃=.0064	𝑃=.0018
	Medium	18.95	43.65	−28.23	—	0.45	0.77
		𝑃<.0001	𝑃<.0001	𝑃<.0001
	Large	28.26	202.61	−266.84	85.13	0.72	0.50
		𝑃<.0001	𝑃<.0001	𝑃<.0001	𝑃=.0007
Instantaneous method	Small	3.19	−33.75	303.59	−214.26	0.48	0.89
		𝑃=.77	𝑃=.69	𝑃=.0804	𝑃=.0216
	Medium	2.63	175.79	−115.60	—	0.57	0.76
		𝑃=.7050	𝑃<.0001	𝑃<.0001
	Large	20.32	316.52	−388.88	115.79	0.67	0.53
		𝑃=.0087	𝑃<.0001	𝑃<.0001	𝑃=.0075