Displaying 20 results from an estimated 2000 matches similar to: "Is there an implementation of loess with more than 3 parametric ..."
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
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
2005 Aug 29
2
test for readline installation fails if installation location non-standard (PR#8104)
Full_Name: D Kreil
Version: 2.1.1
OS: HP-UX B.11.23 U ia64 0029870451 unlimited-user license
Submission from: (NULL) (62.178.15.60)
When the dependency readline is installed in a non-standard location the
installation procedure fails.
If using a non-standard installation location like
--prefix=/bi/common --exec-prefix=/bi/arch
the configure script default include and library paths should
2002 Sep 15
7
loess crash
Hi,
I have a data frame with 6563 observations. I can run a regression with
loess using four explanatory variables. If I add a fifth, R crashes. There
are no missings in the data, and if I run a regression with any four of the
five explanatory variables, it works. Its only when I go from four to five
that it crashes.
This leads me to believe that it is not an obvious problem with the data,
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
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
2023 Mar 23
2
loess plotting problem
For some reason the following code is not plotting as I want it to. I want
to plot a "loess" line plotted over a scatter plot. I get a jumble, with
lines connecting all the points. I had a similar problem with "lowess". I
solved that by dropping "NA" rows from the data columns. Please help.
library(stats)
attach(gini_pci_wdi_narm)
plot(ny_gnp_pcap_pp_kd, si_pov_gini)
2010 May 31
3
What does LOESS stand for?
Dear R-community,
maybe someone can help me with this:
I've been using the loess() smoother for quite a while now, and for
the matter of documentation I'd like to resolve the acronym LOESS.
Unfortunately there's no explanation in the help file, and I didn't
get anything convincing from google either.
I know that the predecessor LOWESS stands for "Locally Weighted
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 May 03
2
Finding local maxima on a loess surface
If a run a LOESS model and then produce a smoothed surface: Is there any
way to determine the coordinates of the local maxima on the surface?
[[alternative HTML version deleted]]
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
2003 Jun 27
2
NA points in loess function
Gurus,
I used
predict(loess(Y~X));
where Y and X are of the same length. But there are same NA's in both Y and
X. Those NA's are in the same locations in Y and X. The following is the
error messageI got:
Error in "[<-"(*tmp*, , i, value = predict(loess(Y~X))) :
number of items to replace is not a multiple of replacement length
If I replaced the NA's with a
2008 Feb 03
3
Drawing a loess line
Dear all,
To draw a lowess line on a plot was a piece of cake; to draw a loess
line, however, seems not that easy. Is the loess plotting implemented
at all in relation to the loess function, or do I have to look in
add-on packages?
Thanks,
Marcin
2007 Feb 08
1
Point estimate from loess contour plot
Hi,
I was wondering if anyone knows of a way by which one can estimate values
from a contour plot created by using the loess function? I am hoping to
use the loess contour plot as a means of interpolation to identify
the loess created values at points at pre-defined (x,y) locations.
Could anyone point me in the right direction please?
Thanks.
Laura Quinn
Institute of Atmospheric Science
School
2005 Oct 20
2
information about Loess
Hello,
I'm currently using a tool that provides a Loess fitting, but I obtained results that are slightly different from those provided by R implementation of the Loess. That's why I would like to know if you could give me a source (bibliography or web) that explains in a clear way each step of the algorithm, with the possible options to choose, etc.. in order for me to understand those
2009 Apr 14
4
Forcing the extrapolation of loess through the origin
Hi all,
I'm fitting a line to my dataset. Later I want to predict missing values that exceed the [min,max] interval of my empirical data, therefore I choose surface="direct" for extrapolation.
l1<-loess(y1~x1,span=0.1,data.frame(x=x1,y=y1),control=loess.control(surface="direct"))
In my application it is highly important that the fitted line intercepts at the point of
2012 Nov 20
2
Help with loess
Not sure what I'm doing wrong. Can't seem to get loess values. It looks like
loess is returning the same values as the input.
j <-loess(x1$total~as.numeric(index(x1)
plot(x1$total,type='l', ylab='M coms/y global',xlab='')
lines(loess(total~as.numeric(index(x1)),x1))
The plot statement works fine
No errors with the "lines" statement
But I don't