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External validation of estimated risk-perception index with independent survey estimates in randomly selected tracts in Imperial County (Brawley), CA (Left); and Peoria County, IL (Right). The mean absolute error between MRP model estimates and the external survey results was 2.7 points. The risk-perception index is generally higher in Brawley than in Peoria. In both census tracts, Hispanic females have the highest risk perceptions, while white males have the lowest.
