search for: vinyes

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2009 Mar 03
2
modifying a built in function from the stats package (fixing arima)
Dear members of the list, I'm a beginner in R and I'm having some trouble with: "Error in optim(init[mask], armafn, method = "BFGS", hessian = TRUE, control = optim.control, : non-finite finite-difference value [8]" when running "arima". I've seen that some people have come accross the same problem:
2009 Mar 26
1
arima, xreg, and the armax model
...cently been suggested (by a reliable source) that using xreg in arima() does NOT fit an ARMAX model [insert slap head icon here]. This will be investigated as soon as time permits.>> (by R.H. Shumway & D.S. Stoffer) This is quite surprising... Does anybody know anything about it? Marc Vinyes (AleaSoft) [[alternative HTML version deleted]]
2009 Mar 03
1
modifying a built in function from the stats package (fixing arima)
Dear members of the list, I''m a beginner in R and I''m having some trouble with: "Error in optim(init[mask], armafn, method = "BFGS", hessian = TRUE, control = optim.control, : non-finite finite-difference value [8]" when running "arima". I''ve seen that some people have come accross the same problem: