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san
2011 Feb 12
2
Time unit in ts() and arima() functions
...o, when I use the "arima(...)" function to fit a model (almost the
same kind of algorithm which appeared here some days ago), and I specify
in the "seas=" parameter, "frequency = 7", or "frequency = frequency(a)"
(a is the time series), I can get arN, maN, sarN, smaN... coefficients.
What unit shall be applied to these coefficients ? One day or one week ?
Logically (and ideally), for me, one day for arN and maN and one week
for sarX and smaX coefficients, but I'm not sure.
I have the same kind of doubt about lag units when I apply the acf()
funct...