formula
object that
can be used in a call to hhh4
to model
seasonal variation via a sum of sine and cosine terms.addSeason2formula(f = ~1, S = 1, period = 52, timevar = "t")
~1
.S
is a vector,
unit-specific seasonal terms are created."t"
.formula
with the seasonal terms added and
its environment set to .GlobalEnv
.
Note that to use the resulting formula in hhh4
,
a time variable named as specified by the argument timevar
must
be available.timevar
, to an existing formula f
. Note that the seasonal terms can also be expressed as
hhh4
, fe
, ri
# add 2 sine/cosine terms to a model with intercept and linear trend
addSeason2formula(f = ~ 1 + t, S = 2)
# the same for monthly data
addSeason2formula(f = ~ 1 + t, S = 2, period = 12)
# different number of seasons for a bivariate time series
addSeason2formula(f = ~ 1, S = c(3, 1), period = 52)
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