AR1 in gls function
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 at geol.uoa.gr Web address: http://users.auth.gr/~zanis/