This research is a survey research. By, for example, used in the study is that the people who use the subway service in Bangkok of 400 people, where sample size is derived from the formula calculation Yamaguchi ne.
This research was survey research. The samples used in the study. People who use the subway A total of 400 people, which is derived from a sample size calculation Yamane.
This survey research The data used in this study is The people who use the subway in the metropolitan area of 400 people, which is derived from the sample size calculation formula Yamane.