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A Question on lowess() function

Liaw, Andy

Thu, Apr 10, 2003 4:54 PM

On the "See Also" section of the help page to loess(), there's a link to
"predict.loess".  On that help page, under "Arguments":

newdata   an optional data frame specifying points at 
          which to do the predictions. If missing, the 
          original data points are used. 

There, I've read the documentation for you.

Andy

-----Original Message-----
From: Minghua Yao [mailto:myao at ou.edu]
Sent: Thursday, April 10, 2003 6:03 PM
To: Prof Brian Ripley
Cc: r-help at stat.math.ethz.ch
Subject: RE: [R] A Question on lowess() function


I still haven't found out from the mail archieves

How to get the LOWESS or LOESS fitting values for any elements in x?

Help please. Thanks.

-MY

-----Original Message-----
From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
Sent: Thursday, April 10, 2003 3:21 PM
To: Minghua Yao
Cc: r-help at stat.math.ethz.ch
Subject: RE: [R] A Question on lowess() function


On Thu, 10 Apr 2003, Minghua Yao wrote:

Thank you for your reply.

I didn't find what I needed from the archieves. Maybe, I

need to figure
out

how to search the archieves effectively.

I used y<-x[!is.na(x)] to get rid of NA and NaN. But I

don't know how to
get

rid of Inf.

That's not what you asked for, and is.finite() will do that 
(if you apply
it to x as well).

Also, is there more detailed info about loess() than help(loess)?

Look at the na.action parameter ..., as well as the references.

Thanks.

-MY

-----Original Message-----
From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
Sent: Thursday, April 10, 2003 1:38 PM
To: Minghua Yao
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] A Question on lowess() function

lowess was old-fashioned a decade ago: use loess.

And this Q was answered about a week ago, so use the archives.

On Thu, 10 Apr 2003, Minghua Yao wrote:

I want to use lowess(x, y) where x and y are vectors of

length of 4000+.

In

fact, x and y are log of some vectors. So, some of the

elements are NaN.

lowess() can not take away those elements then do the

fitting. It will

give

the error message and do nothing.

1. Can anybody tell me how to get rid of those NaN's and

use lowess()?

2. How to get the LOWESS fitting values for any elements in x?



--
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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