Try:
ar(logrvar, aic=TRUE)$resid
The problem you are running into is that
'resid' is a generic function, and the 'ar'
function neither returns an object with a
class nor returns an object that the default
method works with.
The 'summary' command you used might have
instead used 'str'.
The 'hints' document mentioned in my signature
might help you with such questions.
Welcome to the R world.
On 18/07/2010 18:16, maxcheese wrote:
Hello, I just started learning R and have a very basic question:
When I try ar model and extract residuals it returns Null. Could someone
explain what's going on here? Does that mean the model is null? But it
seems residual has a length=# observation of the original series according
to the model summary. I am learning it by myself and have no one to ask
here so please allow me to ask this very basic question... Thank you very
much.
summary(ar(logrvar, aic=TRUE))
Length Class Mode
order 1 -none- numeric
ar 40 -none- numeric
var.pred 1 -none- numeric
x.mean 1 -none- numeric
aic 44 -none- numeric
n.used 1 -none- numeric
order.max 1 -none- numeric
partialacf 43 -none- numeric
resid 20731 -none- numeric
method 1 -none- character
series 1 -none- character
frequency 1 -none- numeric
call 3 -none- call
asy.var.coef 1600 -none- numeric
resid(ar(logrvar, aic=TRUE))
NULL
--
Patrick Burns
pbu...@pburns.seanet.com
http://www.burns-stat.com
(home of 'Some hints for the R beginner'
and 'The R Inferno')
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