[Mixed logit model and its application in insurance choices of the new rural cooperative medical system]. 
To apply mixed logit model for analyzing the data of new rural cooperative medical with suitability and identify the factors affecting the residents choices of insurance mode.  Hypothesis test of IIA was performed using the mogtest module of Stata10.0 to test the eligibility of the condition.  The mixed logit model was established to allow the parameters to vary in the population using SAS9.1 MDC module.  The data in this study did not satisfy the IIA assumption (P<0.01), so that the multinomial logit model was not applicable.  The adjusted Estrella of the mixed logit model was 0.6658.  The mixed logit approach does not rely on the restrictive IIA assumption and allows for correlation patterns between choices and individual variation.  This approach can help in the determination of the choices in new rural cooperative medical system.