Qualitative methods for reasoning under uncertainty may be helpful in situations where quantification of uncertainty is not appropriate. We demonstrate another use for qualitative models. The qualitative analysis of a quantitative model of uncertainty will reveal the qualitative behaviour of that model when new evidence is obtained. This qualitative behaviour can be compared with the specificat...

For a dynamical system, if only the qualitative state [x(k)] of the state x(k) is available, we cannot predict the state trajectory uniquely due to ambiguity in the predicted state trajectories. A stochastic automaton is proposed as a qualitative model for such dynamical systems. We estimate the probability transition matrices of the stochastic automaton using a novel approach. We show that a q...

background: relapse is a common problem in drug user’s rehabilitation program and reported in all over the country. an in-depth study on patients’ experiences can be used for exploring the relapse process among drug users. therefore, this study suggests a model for relapse process among iranian drug users. methods: in this qualitative study with grounded theory approach, 22 participants with ri...