1.Group size (X1)
2. Fare deviation to income ratio (X2) de- fined as (FSA fare - LCC fare)/Income
3. Waiting time deviation multiplied by in- come (X3) defined as (FSA waiting time – LCC waiting time)*Income
4. Satisfaction level on punctuality (X4) coded as 1, 0, and -1 if FSA>LCC, FSA= LCC, FSA5. Satisfaction level on safety (X5) coded as 1, 0, and -1 if FSA>LCC, FSA=LCC, FSA
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