Only know that it is usefull for Bond portfolio where there is a non-parallel shifts in YTM, Other than that dont know anything
I wrote an article on key rate duration that may be of some help: http://financialexamhelp123.com/key-rate-duration/
Note, however, that this is really a Level II topic. I wouldn’t worry about it at Level I.
But it is given in LOS 56.d
In that case . . . read the article.
Thank you !
My pleasure.