## An application of latent trait theory in understanding transportation energy conservation behavior |

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264 subjects action items applies latent trait auto ownership levels bus or subway Cancel a vacation car don't replace car tuned Carpool classical test theory closer to home common factor conditional probability conservation actions conserve gasoline Department of Transportation eigenvalues energy conservation factor analysis results factor loadings fixed level household item calibration item characteristic functions item discrimination parameter item endorsement item g item response categories item response tendencies item variable job closer latent construct latent continuum latent space latent trait estimates latent trait theory likelihood function linear combination Neveu non-work trips normal ogive model observed item score operating characteristic functions parameter normal ogive polychoric position in latent principal factor analysis principal factor solution Psychometric questionnaire recreation vehicles relationship between item Replace a car sample set of items standard error subjects endorsed survey Take bus Take vacation closer test information function tetrachoric correlation coefficients vacation trip York State Department