A composite index called the Environmental Performance Index (EPI) was obtained to evaluate countries’ environmental performance. This calculated for 180 countries concerning 24 indicators. However, it is well known that there are huge differences between regarding factors besides social, economic, and cultural factors. case aggravates doubt data set has outliers. Therefore, values should be su...

Abstract—Study of fuzzy time series has increasingly attracted much attention due to its salient capabilities of tackling vague and incomplete data. A variety of forecasting models have devoted to improve forecasting accuracy. Recently, Fuzzy time-series based on Fibonacci sequence has been proposed as a new fuzzy time series model which incorporates the concept of the Fibonacci sequence, the f...