Spatial Dispersal of Douglas-Fir Beetle Populations in Colorado and Wyoming

Table 2

Analysis of variance table for regression parameter estimates for the model describing the relationship between standard dispersal distance and area infested by Douglas-fir beetle.

Dependent variable	= log (SDD)	𝑅^2 = 0.296
Source	DF	Sum of squares	Mean square	𝐹 value	Pr > 𝐹
Model	4	2.246	0.562	5.77	0.0006
Error	55	5.352	0.097
Corrected total	59	7.598
Variable	DF	Parameter estimate	Standard error	𝑡 value	Pr > |𝑡|
Intercept (WY)	1	2.625	0.279	9.42	<.0001
Log (area)	1	0.169	0.074	2.27	0.0270
Region—ECO	1	0.070	0.112	0.62	0.5362
Region—NWCO	1	−0.292	0.133	−2.19	0.0324
Region—SWCO	1	−0.166	0.111	−1.50	0.1389