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agrain
2005 Oct 13
1
arima: warning when fixing MA parameters.
...y a second seasonal term). Is there
some deep reason why AR parameters
("Warning message: some AR parameters were fixed: ...")
should somehow intrude into the fitting of a model that has only MA
terms?
> library(DAAG)
> attach(bomsoi)
> # The following is fine:
> arima(avrain, order=c(0,0,4), seasonal=list(order=c(0,0,1),
period=12),
+ fixed=c(NA,0,0,NA,NA,NA))
.....
> # The following generates a warning message
> arima(avrain, order=c(0,0,4), seasonal=list(order=c(0,0,1),
period=12),
+ fixed=c(0,0,0,NA,NA,NA))
Call:
arima(x = avrain, order = c(0, 0, 4),...