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The fitted values are the observed minus residuals. If there is differencing, the observed values are those corresponding to the differenced time series.
# S3 method for FitARMA fitted(object, ...)
class FitARMA object
auxiliary parameters
vector or ts object
FitARMA
# NOT RUN { data(SeriesA) out<-FitARMA(SeriesA, c(1,0,1)) fitted(out) # }
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