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We compare multinomial logit and mixed logit models for data on California households' revealed and stated preferences for automobiles. The stated preference data elicited households' preferences among gas, electric, methanol, and CNG vehicles with various attributes. The mixed logit models provide a much better fit to these data, and forecasting exercises(More)
The authors compare a variety of different designs for choice experiments that satisfy the properties of the MNL model. These include both previously published and new design approaches: the latter are based on " shifting " design codes to create choice alternatives that maximize the number of attribute comparisons. An analysis of relative statistical(More)
We present FORTRAN 77 subroutines that solve statistical parameter estimation problems for general nonlinear models, e.g., nonlinear least-squares, maximum likelihood, maximum quasi-likelihood, generalized nonlinear least-squares, and some robust fitting problems. The accompanying test examples include members of the generalized linear model family,(More)
The standard implementation of enzyme-linked immunosorbent assay (ELISA) for single analytes can lead to false conclusions if cross reacting compounds are present in the sample. This paper discusses the extension of the usual four-parameter logistic model for ELISA to the case of multiple cross-reacting analytes. The use of the extended model in(More)
is one of ten regioual units mandated by Congress and Angeles: and several academic departments at the Berkeley, Davis, lrvine, and Los Angeles campuses. Faculty and students on other University of California campuses may participate in Center activities. Researchers at other universities within the region also have opportunities to collaborate on selec-led(More)
The Umvers2ty of Califorrda TransportaUon Center (UCTC) 2s eric of ten regional urn-is mandated by Congress and established in Fall 198g to support research, cducauon, and trazmng m su~ace ~ns-ponaUon. The UC Center serves federal Region IX and is supposed by matching gTan~ from the U.S. Department of Transpo~a~on, the California Department of Transportauon(More)