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Volume 8, Number 3—March 2002

Predicting the Risk of Lyme Disease: Habitat Suitability for Ixodes scapularis in the North Central United States

Marta Guerra*, Edward D. Walker†, Carl Jones*, Susan Paskewitz‡, M. Roberto Cortinas*, Ashley Stancil‡, Louisa Beck§, Matthew Bobo§, and Uriel Kitron*Comments to Author 
Author affiliations: *University of Illinois College of Veterinary Medicine, Urbana, Illinois, USA; †Michigan State University, East Lansing, Michigan, USA; ‡University of Wisconsin, Madison, Wisconsin, USA; §NASA Ames Research Center, Moffett Field, California;

Main Article

Table 1

Significant environmental variables to determine favorable habitat for Ixodes scapularis using discriminant analysis

Groups (sample size)
0 vs. 1,2,3
(47 vs. 65) 0,1 vs. 2,3
(63 vs. 69) 0 vs. 1 vs. 2 vs. 3
(47 vs. 16 vs. 24
vs. 25)
Variable Wilk’s
lambda Disc
F(x) Wilk’s
lambda Disc
F(x) Wilk’s
lambda Disc
F(x)1 Disc
Forest type 0.784 0.552 0.789 0.789 0.754 0.665 -0.747
Soil order 0.618 0.521 0.699 0.542 0.569 0.633 0.774
Land cover 0.586 0.387
Soil texture 0.564 0.381
Bedrock 0.525 0.518
Eigenvalue 0.904 0.431 0.681 0.045
coefficient 0.689 0.549 0.636 0.207
% correctly
classified 85.7 78.6 51.8

Main Article

Page created: July 14, 2010
Page updated: July 14, 2010
Page reviewed: July 14, 2010
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