However, PSM can’t make deeply evaluation on the price range which is not included in the subjects’ responses because it only expands on each price. In other words, it can only briefly estimate the untouchable price district. However, when the comparative accumulation section is changed, the curve may be changed as well. Kishi Logit PSM (KLP) has improved applying four relative cumulative frequencies regressed by using the logit model. When a dependent variable lies between 0 and 1, it is equal to the relative cumulative frequency. As the logit model is a continuous function, KLP can circumstantially analyze consumers' evaluation on any prices. According to equation (1) and equation (2), the resulting curves are shown in Figure 6 (Kishi et al. 2002, 2003, 2005).