Defining and characterizing Aflatoxin contamination risk areas for corn in Georgia, USA: Adjusting for collinearity and spatial correlation

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dc.contributor.authorYoo, EunHye
dc.contributor.authorKerry, Ruth
dc.contributor.authorIngram, Benjamin R.
dc.contributor.authorOrtiz, Brenda
dc.contributor.authorScully, Brian
dc.date.accessioned2018-07-06T08:39:40Z
dc.date.available2018-07-06T08:39:40Z
dc.date.issued2018-07-02
dc.description.abstractAflatoxin is a carcinogenic toxin to humans and animals produced by mold fungi in staple crops. Surveys of Aflatoxin are expensive, and the results are usually not available for implementing within season mitigation strategies. Identification of high and low risk areas and years is essential to reduce the number of samples analyzed for Aflatoxin concentration. Previously a risk factors approach was developed to determine county level Aflatoxin contamination risk in southern Georgia, but Aflatoxin concentrations and risk factor data were not analyzed simultaneously and all risk factors had equal weight which is unrealistic. In the current paper we propose a regression approach to overcome these problems. Spatial Poisson profile regression identified clusters of counties which have similar Aflatoxin risk and risk factor profiles, whilst explicitly taking into account multicollinearity in the risk factor data and spatial autocorrelation in the Aflatoxin data. This approach allows examination of the utility of different highly correlated variables including remotely sensed data that could give information at the sub-county level. The results identify plausible clusters compared to previous work but also give the relative importance of the risk factors associated with those clusters. The approach also helps show that some factors like well-drained soil behave differently from expectations and irrigation data is not useful.en_UK
dc.identifier.citationYoo E, Kerry R, Ingram B, et al., (2018) Defining and characterizing Aflatoxin contamination risk areas for corn in Georgia, USA: Adjusting for collinearity and spatial correlation. Spatial Statistics, Volume 28, December 2018, pp. 84-104en_UK
dc.identifier.issn2211-6753
dc.identifier.urihttp://dx.doi.org/10.1016/j.spasta.2018.06.003
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13324
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectSpatial autocorrelationen_UK
dc.subjectProfile regressionen_UK
dc.subjectAflatoxin contamination risken_UK
dc.subjectRisk factorsen_UK
dc.subjectMulticolinearityen_UK
dc.titleDefining and characterizing Aflatoxin contamination risk areas for corn in Georgia, USA: Adjusting for collinearity and spatial correlationen_UK
dc.typeArticleen_UK

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