| Specials {sspir} | R Documentation |
Auxiliary function for modelling the time-dependent trend patterns
when formulating ssm models.
polytrig(time, period = 365.25, degree = 1) polytime(time, degree = 1) sumseason(time, period = 12) season(time, period = 12)
time |
a vector giving the observation times, eg. 1:n. |
period |
the period of the seasonal pattern. |
degree |
the degree of the trigonometric polynomial or the degree of the polynomial time trend. |
polytrig defines a trigonometric polynomial in time,
polytime defines a polynomial time trend, sumseason
produces a seasonal pattern in which the factors sum to zero over the
period, and season defines a factor.
Claus Dethlefsen and Søren Lundbye-Christensen.
ssm, kfilter,
smoother, getFamily.