I actually know nothing about the application of Prescott's work but the H-P filter for choosing the trend of noisy time-series data I do use. My only complaint is that it does not produce a function (each point in time is the result of a separate minimization) so it could be used in simple forecasting.
Jim
"and now they are all men complete and fully grown go buy a piece of linen and make yourself a shroud to mourn those hands to mourn those hands you'll never know"
-Sally Timms, "little Tommy Tucker"
Quoting Doug Henwood <dhenwood at panix.com>:
> A Nobel Prize for Not Much
>
> by Frank Shostak
>
"