[Quantlib-users] Determine Option-Adjusted Spread (OAS) of Callable Bond

[Jan M. <jan...@gm...>]

Hey,

I am attempting to price a callable bond and determine the option-adjusted
spread of a callable bond under the Hull-White model. I have an example of
code attached enclosed:

https://stackoverflow.com/questions/67370737/oas-quantlib-of-callable-bond

Unfortunately, the results I am obtaining for OAS are always negative,
though the obtained bond yields from the same object seem reasonable. Does
anyone have any ideas of what is going wrong?

The bond should be callable on either a) the call dates (European) at the
prices provided or b) on the coupon dates (Bermudan/American).

Best Regards,
Jan Muller