[R] AR1 in gls function

From: Prodromos Zanis <pzanis_at_geol.uoa.gr>
Date: Fri 15 Apr 2005 - 17:16:38 EST


Dear R-project users

I would like to calculate a linear trend versus time taking into account a first order autoregressive process of a single time series (e.g. data$S80 in the following example) using th gls function.

gls(S80 ~ tt,data=data,corAR1(value, form, fixed))

My question is what number to set in the position of value within corAR1? Should it be the acf at lag 1?

I look forward for your reply

With kind regards

Prodromos Zanis

-- 
****************************************************
Dr. Prodromos Zanis
Centre for Atmospheric Physics and Climatology
Academy of Athens
3rd September 131, Athens 11251, Greece
Tel. +30 210 8832048
Fax: +30 210 8832048
e-mail: pzanis@geol.uoa.gr
Web address: http://users.auth.gr/~zanis/

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Received on Fri Apr 15 17:20:40 2005

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