Reducing a spatial database to its effective dimensionality for logistic-regression analysis of incidence of livestock disease

Reducing a spatial database to its effective dimensionality for logistic-regression analysis of... Large databases with multiple variables, selected because they are available and might provide an insight into establishing causal relationships, are often difficult to analyse and interpret because of multicollinearity. The objective of this study was to reduce the dimensionality of a multivariable spatial database of Zimbabwe, containing many environmental variables that were collected to predict the distribution of outbreaks of theileriosis (the tick-borne infection of cattle caused by Theileria parva and transmitted by the brown ear tick). Principal-component analysis and varimax rotation of the principal components were first used to select a reduced number of variables. The logistic-regression model was evaluated by appropriate goodness-of-fit tests. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Preventive Veterinary Medicine Elsevier

Reducing a spatial database to its effective dimensionality for logistic-regression analysis of incidence of livestock disease

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Publisher
Elsevier
Copyright
Copyright © 1997 Elsevier Ltd
ISSN
0167-5877
eISSN
1873-1716
DOI
10.1016/S0167-5877(97)00019-6
Publisher site
See Article on Publisher Site

Abstract

Large databases with multiple variables, selected because they are available and might provide an insight into establishing causal relationships, are often difficult to analyse and interpret because of multicollinearity. The objective of this study was to reduce the dimensionality of a multivariable spatial database of Zimbabwe, containing many environmental variables that were collected to predict the distribution of outbreaks of theileriosis (the tick-borne infection of cattle caused by Theileria parva and transmitted by the brown ear tick). Principal-component analysis and varimax rotation of the principal components were first used to select a reduced number of variables. The logistic-regression model was evaluated by appropriate goodness-of-fit tests.

Journal

Preventive Veterinary MedicineElsevier

Published: Oct 1, 1997

References

  • The Epidemiology of Theileriosis in Africa
    Norval, R.A.I; Perry, B.D; Young, A.S

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