Hi, 

I'm working on a multivariate ARIMA model. I have 2 time series and found
for each an ARIMA model
I'd like to know how are calculated the residuals of my arima model using
residuals() function in R ?
Is it as I think predicted values (from ARIMA model) - observed values ?

Is it relevant to use the residuals of my models to realize the
cross-correlation between my 2 time series?

Thanks
Myriam
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