Displaying 20 results from an estimated 9000 matches similar to: "LOESS (PR#9064)"
2006 Jul 07
0
User Error (was LOESS (PR#9064))
Please do as we ask (repeatedly) and study the help page before posting.
'family' is a separate argument, not part of loess.control, as the help
page correctly documents. If you use
cars.lo2 <- loess(dist ~ speed, cars, family = "symmetric",
control = loess.control(surface = "direct", iterations = 20))
cars.lo2$pars$iterations
it prints *20*, as it is
2005 Jul 12
1
getting panel.loess to use updated version of loess.smooth
I'm updating the loess routines to allow for, among other things,
arbitrary local polynomial degree and number of predictors. For now,
I've given the updated package its own namespace. The trouble is,
panel.loess still calls the original code in package:stats instead of
the new loess package, regardless of whether package:loess or
package:lattice comes first in the search list. If I
2010 Oct 19
3
scatter.smooth() fitted by loess
Hi there,
I would like to draw a scatter plot and fit a smooth line by loess.
Below is the data.
However, the curve line started from 0, which my "resid" list doesn't
consist of 0 value.
It returned some warnings which I don't know if this is the reason
affecting such problem. Here I also attached the warning messages.
Please let me know if there is a solution to fix this. Thank
2011 Jun 11
1
Is there an implementation loess with more than 4 parametric predictors or a trick to similar effect?
Dear R experts,
I have a problem that is a related to the question raised in this earlier
post
https://stat.ethz.ch/pipermail/r-help/2007-January/124064.html
My situation is different in that I have only 2 predictors (coordinates x,y)
for local regression but a number of global ("parametric") offsets that I
need to consider.
Essentially, I have a spatial distortion overlaid over a
2011 Jun 16
0
Update: Is there an implementation of loess with more than 3 parametric predictors or a trick to a similar effect?
Dear R developers!
Considering I got no response or comments in the general r-help forum
so far, perhaps my question is actually better suited for this list? I
have added some more hopefully relevant technical details to my
original post (edited below).
Any comments gratefully received!
Best regards,
David Kreil.
----------
Dear R experts,
I have a problem that is a related to the question
2004 Apr 09
1
loess' robustness weights in loess
hi!
i want to change the "robustness weights" used by loess. these
are described on page 316 of chambers and hastie's "statistical models in S"
book as
r_i = B(e_i,6m)
where B is tukey's biweight function, e_i are the residulas, and m is the
median average distance from 0 of the residuals. i want to
change 6m to, say, 3m.
is there a way to do this? i cant
2003 Dec 25
3
Problem plotting with xyplot
Hi all,
I am just learning R and I am trying to work through the book "Applied
Longitudinal Data Analysis" by Singer & Willett. I have some code for this book
that supposedly works in S-Plus (I don't have S-Plus so I can't verify that) and
I am trying to run the examples in R. Most of the examples run, but I have
one plot that gives me an error message. I have
2008 Feb 25
1
r44608 fails make check-all in scatter.smooth example
Dear List,
Having had my appetite sufficiently whetted by Prof. Ripley's email
about the new graphics capabilities in Unixes, I wanted to try them out.
I updated to svn r44608, configured with the following options:
R is now configured for x86_64-unknown-linux-gnu
Source directory: ..
Installation directory: /usr/local
C compiler: gcc -O3 -g -std=gnu99
2011 Jun 11
0
Is there an implementation of loess with more than 3 parametric predictors or a trick to a similar effect? [re-posting as plain text to pass char-set filter]
Dear R experts,
I have a problem that is a related to the question raised in this earlier post
??? https://stat.ethz.ch/pipermail/r-help/2007-January/124064.html
My situation is different in that I have only 2 predictors
(coordinates x,y) for local regression but a number of global
("parametric") offsets that I need to consider.
Essentially, I have a spatial distortion overlaid over a
2008 Apr 29
4
Applying user function over a large matrix
Respected R experts,
I am trying to apply a user function that basically calls and
applies the R loess function from stat package over each time
series. I have a large matrix of size 21 X 9000000 and I need
to apply the loess for each column and hence I have
implemented this separate user function that applies loess
over each column and I am calling this function foo as follows:
2008 Jul 08
1
R crash with ATLAS precompiled Rblas.dll on Windows XP Core2 Duo
I noticed a problem using R 2.7.1 on Windows XP SP2 with the precompiled
Atlas Rblas.dll. Running the code below causes R to crash. I started R
using Rgui --vanilla and am using the precompiled Atlas Rblas.dll from
cran.fhcrc.org dated 17-Jul-2007 05:04 for Core2 Duo.
The code that causes the crash:
x <- rnorm(100)
y <- rnorm(100)
z <- rnorm(100)
loess(z ~ x * y)
loess(z ~ x) does
2010 Feb 07
2
predicting with stl() decomposition
Hi mailinglist members,
I’m actually working on a time series prediction and my current approach is
to decompose the series first into a trend, a seasonal component and a
remainder. Therefore I’m using the stl() function. But I’m wondering how to
get the single components in order to predict the particular fitted series’.
This code snippet illustrates my problem:
series <-
2013 Mar 01
1
predict.loess() segfaults for large n?
Hi,
I am segfaulting when using predict.loess() (checked with r62092).
I've traced the source with the help of valgrind (output pasted
below) and it appears that this is due to int overflow when
allocating an int work array in loess_workspace():
liv = 50 + ((int)pow((double)2, (double)D) + 4) * nvmax + 2 * N;
where liv is an (global) int. For D=1 (one x variable), this
overflows at
2010 Jan 01
3
loess() crashes R on my system
Greetings and happy new year!
I am in the process of converting some of the old S-PLUS scripts from
Visualizing Data (Cleveland, 1993)
into lattice. In fact, I did most of it several years ago, and at the time,
all of the scripts that contained
loess() worked fine. Tonight, I ran most of the scripts again, but every one
that I tried with a
loess() call crashed R. I tried it in two sessions, one
2011 Jun 24
2
Is there an implementation of loess with more than 3 parametric ...
Dear John,
> I suggest that you look at the abilities of the mgcv package.
> There are notes of mine at
>
> http://www.maths.anu.edu.au/%7Ejohnm/r-book/xtras/autosmooth.pdf
>
> that may help you get started.
Thank?you very much for the suggestion and the link to your write-up,
it was indeed very helpful!
I have experimented with this library for a while now and am really
happy
2023 Mar 23
1
loess plotting problem
Thanks, John.
However, loess.smooth() is producing a very different curve compared to the
one that results from applying predict() on a loess(). I am guessing they
are using different defaults. Correct?
On Thu, 23 Mar 2023 at 20:20, John Fox <jfox at mcmaster.ca> wrote:
> Dear Anupam Tyagi,
>
> You didn't include your data, so it's not possible to see exactly what
>
2011 Jul 12
1
LOESS function Newton optimization
I have a question about running an optimization function on an existing LOESS
function defined in R. I have a very large dataset (1 million observations)
and have run a LOESS regression. Now, I want to run a Newton-Raphson
optimization to determine the point at which the slope change is the
greatest.
I am relatively new to R and have tried several permutations of the maxNR
and nlm functions with
2023 Mar 23
1
loess plotting problem
Dear Anupam Tyagi,
You didn't include your data, so it's not possible to see exactly what
happened, but I think that you misunderstand the object that loess()
returns. It returns a "loess" object with several components, including
the original data in x and y. So if pass the object to lines(), you'll
simply connect the points, and if x isn't sorted, the points
2012 Apr 03
2
How does predict.loess work?
Dear R community,
I am trying to understand how the predict function, specifically, the
predict.loess function works.
I understand that the loess function calculates regression parameters at
each data point in 'data'.
lo <- loess ( y~x, data)
p <- predict (lo, newdata)
I understand that the predict function predicts values for 'newdata'
according to the loess regression
2010 Oct 26
2
anomalies with the loess() function
Hello Masters,
I run the loess() function to obtain local weighted regressions, given
lowess() can't handle NAs, but I don't
improve significantly my situation......, actually loess() performance leave
me much puzzled....
I attach my easy experiment below
#------SCRIPT----------------------------------------------
#I explore the functionalities of lowess() & loess()
#because I have