Fuzzy Investment Portfolio Selection Models Based on Interval Analysis Approach

Table 1

The stock return intervals.

Stock name	Interval lower limit	Interval upper limit
Vanke	0.005224	0.031831
Konka	−0.00596	0.021606
Victor onward Textile	0.002509	0.031017
Universe	−0.00717	0.026362
Tellus	−0.03185	0.012672
Shenxin	−0.03593	0.02052
Nonfemet	−0.03978	0.010745
Xinmao S&T	−0.00754	0.022664
INT’L Group	−0.0213	0.01444
Jinlu	−0.0273	0.00901
ZY Environment	−0.01111	0.020413
DaTong Gas	−0.00474	0.021312
Advanced Technology	−0.00708	0.024332
Fujian Electric	−0.00968	0.018596
Sinosteel	−0.01617	0.044893
Huayi Brothers	−0.0378	0.022356
China Merchants Bank	−0.00997	0.013047
Xi’An Aero Engine	−0.0003	0.031385
Ping An	−0.0124	0.01055
Petro China	−0.0207	−0.0007