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Description:
Stated Preference techniques have become a very popular tool for applied transport research. But there is still a lack of tools to test the quality of SP data. The main purpose of this paper is to discuss a set of routines for quality control checks. The focus is on testing three of quality elements; choice making, lexicographic answers and consistency of choice. Few respondents tend to ignore the survey and choose only a particular alternative for all questions, thus making no choice at all. On the other hand, some individuals are biased toward a particular factor (ex. Price) and make no trade between the attributes, hence making a lexicographic choice. The routines are designed in C++, which work on the data entered by the user, in a text format (.txt). The output is a set of text files giving the results and analysis of the tests.