seasonal.dummies {uroot} | R Documentation |
Generate variables of seasonal dummies and seasonal cycles.
seasonal.dummies(x) seasonal.cycles(x)
x |
a univariate seasonal time series. |
A multivariate time series containing the dummies or cycles by columns.
# In terms of model fitting # both sets of variables are equivalent x <- diff(log(AirPassengers)) sd <- seasonal.dummies(x) fit1 <- lm(x ~ sd[,-1]) summary(fit1) sc <- seasonal.cycles(x) fit2 <- lm(x ~ sc) summary(fit1) all.equal(fitted(fit1), fitted(fit2))