Although we have already used some functions from the
termstrc package in the previous example to demonstrate how one can determine the ideal number of knot points and also specify those, this process can be done in an easier manner with some further R functions, as shown in the following command lines:
> x <- estim_cs(govbonds, 'GERMANY') > x$knotpoints[] DE0001135101 DE0001141463 DE0001135218 DE0001135317 0.0000 1.006027 2.380274 5.033425 9.234521 31.44657
First we used the
estim_cs function that estimates the term structure of coupon bonds based on cubic splines (Ferstl-Haydn, 2010) and returns the knot points in a list with the
knotpoints name. Please note that
estim_cs works with a list—just like most functions in ...