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...rs beyond -171.4. e.x. gamma(-500.4) I got following: > gamma(-170.4) [1] -5.824625e-308 > gamma(-171.4) [1] 0 Warning message: underflow occurred in 'gammafn' I have tried to use a recursion getting values a little futher -180. How could I solve this problem? Thank you beforehand. Chuse.

...gma^2 estimated as 0.002934: log likelihood = 1293.16, aic = -2576.33 Now, ar2 is not significantly different from zero. I would like to refine the model considering ar1 and ar3 only so I fit a model x[t]=c+m*x[t-1] + n*x[t-3]. Anyone could help me and tell me how to do it? Thank you very much. Chuse

Dear all, Ive just started with R and I have question: how can you change a time from a ts object .i.e 2009.004 to "2009-01-01"? Is there any function for this? I tried around with as.Date... but it hasnt worked. Thank you beforehand. Chuse. [[alternative HTML version deleted]]

Dear R collegues, I am trying to change a ts time such as 2009.004 to a str or POSIX class as "2009-01-01". Is there any function or method to do it?. Thank you beforehand. Chuse.

Hello, I am trying to calculate the autocovariance matrix for any general farima(p,d,q) with p,q > 1. Could anyone give an idea how to implement in R or if there is any package for this? thank you beforehand. Jose.

Dear R collegues, I am trying to change a ts time such as 2009.004 to a str or POSIX class "2009-01-01". Is there any function or method to do it?. Thank you beforehand. Chuse. [[alternative HTML version deleted]]