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sum_um creates a univariate (ARIMA) model from the sum of serveral univariate (arima) models.
sum_um
sum_um(...)
List of "um" S3 objects.
A "um" S3 object.
# NOT RUN { um1 <- um(i = "(1 - B)", ma = "(1 - 0.8B)") um2 <- um(i = "(1 - B12)", ma = "(1 - 0.8B^12)") um3 <- sum_um(um1, um2) # }
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