An ARMA Type Fuzzy Time Series Forecasting Method Based on Particle Swarm Optimization

Table 1

An example time series 𝑋_𝑡.

Date	𝑋𝑡	Membership values
		𝑣1=13000	𝑣2=13500	𝑣3=14000	𝑣4=14500	𝑣5=15000
1971	13055	0.7	0.2	0.1	0	0
1972	13563	0.2	0.7	0.1	0	0
1973	13867	0.1	0.4	0.5	0	0