问题如下:
Which of the following statements regarding ratings transition matrices is least correct?
选项: Transition matrices assess rating
migrations, that is, the probability that a company starting with a particular
rating will be downgraded within the stated period.
The diagonal elements in the transition matrix beginning at the top left show the probability of ending the year with an unchanged rating.
C.Within a transition matrix, there is no transition from default to another rating.
D.The probability of a rating migration is higher for lower rated companies.
解释:
A Transition matrices assess the probability that a company’s rating will remain unchanged at the end of a stated period. Rating migration measures the probability of a change in letter rating, however it encompasses both rating upgrades and downgrades.
请教下老师,为什么不选c?