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The purpose of this research is to propose a method which capitalizes on the complementary strengths of RP and SP choice data to obtain a joint model that can deal with new mode and capture real market behavior accurately . This approach was tested with intercity mode preference data collected in the Tainan-Taipei corridor . This research explored some issues related to RP , SP and joint models , and found the following conclusions :1. The RP model had the best ability to reflect the real market behavior , but could not predict the market share of new mode.2. The inertia variables of SP model were very significant , which implied that the SP choice model was influenced by real choice behvior . In other word , the state dependence was correlated between RP and SP models.3. The scale factor''s problem did exist between RP and SP data , and the estimated value of the scale was less than one , which indicted that the variance of SP data was greater than that of RP data.4. The joint model performed better than RP and SP models in forecasting the new mode''s market share.
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