smper.spl

smper.spl(per)

Smooths the Haar periodogram per using cubic B-splines (as implemented in S-Plus).

Takes:
per The Haar periodogram of a series. Use hper to obtain the periodogram. per$TT does not have to be a power of two.

Returns:
TT The same as per$TT.
S The sequence of smoothed Haar periodogram coefficients.