ICT4TS – Exam summary
20
Covariance matrix between residuals is then proportional to identity. Under this
conditions the selected choice will be maximizing directly the systemic utility.
Then the inclusive utility can be defined as:
And it comes out that p_j is a multinomial logit:
Some properties:
1-
Dependence from the difference of systematic utilities
2-
Influence of the variance of residuals on choice
probability
3-
Independence
of irrelevant alternatives
a.
This is not convenient because is not real (the
probability depends on
the number of choices without considering their utilities)
Dostları ilə paylaş: