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2009 Mar 06
0
modifying a built in function from the stats package (fixing arima) (CONCLUSIONS)
...;t halt parent loops to search for candidate
coefficients):
Note 1: "productive" means I'm a beginner in R so there is probably a better
way to print the error message and fill the output arguments (I only return
NA in aic,var and sigma2).
Note 2: Changing BFGS to Nelder?Mead in "exitpoint 0" changes the
coefficients for which arima can't fit a model but results in terms of aic
and sigma2 also change significantly. By visual inspection I think that BFGS
works better.
function (x, order = c(0, 0, 0), seasonal = list(order = c(0,
0, 0), period = NA), xreg = NULL, include....