[R] AR, Plot

[Prof Brian Ripley]

> Date: Thu, 11 Nov 1999 11:30:33 -0500 (EST)
> From: Giovanni Eduardo Romero <gromero at chass.utoronto.ca>
> 
> 
> I need help with three (apparently) basic things in R:
> 
> 1. How to plot two series agains a third one?? (e.g. a Basic "Excel" graph
> with two variables)

I don't understand that: do matplot or plot + lines do what you want?

> 2. When trying to run AR without constant I get the following (R.0.65.1
> Windows):
> > data(lynx)
> > ar.s1_ar(lynx,order.max=1,demean=FALSE)
> Error: Object "nser" not found
> 
> It only appears when demean=FALSE, for any data set, order or max)

There are several problems with demean=FALSE in 0.65.1 that will be
fixed in 0.90.0.  However, this example is silly: it does need a mean!
I suspect that you also wanted aic=F.

> 3. AR function provides a summary such as lm (standard error, t, p-value,
> etc)??

No, but (approximate) standard errors are in the fit object. You can
write one.

The ts package is still preliminary: the functionality that is similar
to that in S-PLUS works quite well, but the extras (like demean=T)
were not much tested.  Thanks to Adrian Trapletti, many of them have
now been.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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