Displaying 20 results from an estimated 500 matches similar to: "confidence / prediction ellipse"
2010 Aug 05
2
linear model with similar response predictor
Hi,
can somebody tell me why R is not able to calculate a linear model
written in this way?
> lm (seq(1:100)~seq(1:100))
Call:
lm(formula = seq(1:100) ~ seq(1:100))
Coefficients:
(Intercept)
50.5
Warning messages:
1: In model.matrix.default(mt, mf, contrasts) :
the response appeared on the right-hand side and was dropped
2: In model.matrix.default(mt, mf, contrasts) :
problem
2011 Jul 22
2
Fit elipse to xy scatter
Hi,
I know there is a package 'elipse' available but I'm not sure how to use it
for my specific implementation.
What I would like to do is fit an elipse to two lines of identity (at right
angles to each other), as indicated in the following figure:
http://imageshack.us/photo/my-images/30/poincareplotwip.png/
Conceptually, I'm really struggling to even come up with a way of
2010 Oct 11
1
MATLAB vrs. R
I need to find the area under a trapezoid for a research-related project. I was able to find the area under the trapezoid in MATLAB using the code:
function [int] = myquadrature(f,a,b)
% user-defined quadrature function
% integrate data f from x=a to x=b assuming f is equally spaced over the interval
% use type
% determine number of data points
npts = prod(size(f));
nint = npts -1; %number of
2005 Jan 12
4
Finding seasonal peaks in a time series....
I have a seasonal time series. I want to calculate the annual mean
value of the time series at its peak
(say the mean of the three values before the peak, the peak, and the
three values after the peak).
The peak of the time series might change cycle slightly from year to year.
# E.g.,
nPts <- 254
foo <- sin((2 * pi * 1/24) * 1:nPts)
foo <- foo + rnorm(nPts, 0, 0.05)
bar <- ts(foo,
2013 Apr 26
2
Help with dataEllipse function
Hi Everyone,
I am working with the R function "dataEllipse". I plot the 95% confidence
ellipses for several different samples in the same plot and I color-code
the ellipse of each sample, but I do not know how to specify a different
line pattern for each ellipse. I can only modify the pattern for all
ellipses with the "lty" argument. Any help will be highly appreciated.
2005 Jun 25
2
optimization problem in R ... can this be done?
Im trying to ascertain whether or not the facilities of R are sufficient for solving an optimization problem I've come accross. Because of my limited experience with R, I would greatly appreciate some feedback from more frequent users.
The problem can be delineated as such:
A utility function, we shall call g is a function of x, n ... g(x,n). g has the properties: n > 0, x lies on the
2006 Jan 08
1
confint/nls
I have found some "issues" (bugs?) with nls confidence intervals ...
some with the relatively new "port" algorithm, others more general
(but possibly in the "well, don't do that" category). I have
corresponded some with Prof. Ripley about them, but I thought I
would just report how far I've gotten in case anyone else has
thoughts. (I'm finding the code
2001 Feb 28
2
Automating the job?
Hi!
I just started to use R recently, and would like to ask a help about
automating the job.
I need to use "kmeans" function with my own 300 data files, and wonder if
it's possible to do it automatically. For example,
> library (mva)
> mydata <- read.table ("data1")
> cl <- kmeans(mydata, 5, 20)
and I just need to save "cl" info (i.e. the center
2013 Sep 15
1
DataEllipse versus Ellipse Function in R
Hi:
Does Ellipse and dataellipse function in R produce the same ellipse? I
wanted to see how the radius for the Ellipse function in R calculated. Also
what is the var-covariance matrix, if any, assumed for the dataellipse
function? Heres an example of the code where I am generating Multivariate
normal data and creating ellipse using the 2 functions:
library(car)
library(mvtnorm)
mu =
2006 Oct 05
1
unexpected behavior of boxplot(x, notch=TRUE, log="y")
A function I've been using for a while returned a surprising [to me,
given the data] error recently:
Error in plot.window(xlim, ylim, log, asp, ...) :
Logarithmic axis must have positive limits
After some digging I realized what was going on:
x <- c(10460.97, 10808.67, 29499.98, 1, 35818.62, 48535.59, 1, 1,
42512.1, 1627.39, 1, 7571.06, 21479.69, 25, 1, 16143.85, 12736.96,
2006 Jan 23
1
too-large notches in boxplot (PR #7690)
PR #7690 points out that if the confidence intervals (+/-1.58
IQR/sqrt(n)) in a boxplot with notch=TRUE are larger than the
hinges -- which is most likely to happen for small n and asymmetric
distributions -- the resulting plot is ugly, e.g.:
set.seed(1001)
npts <- 5
X <- rnorm(2*npts,rep(3:4,each=npts),sd=1)
f <- factor(rep(1:2,each=npts))
boxplot(X~f)
boxplot(X~f,notch=TRUE)
I can
2019 Jun 12
2
[RFC][SCEV] Behavior of AddRec in CompareSCEVComplexity
Hi,
Thanks for the input. In my ptr_test.O1.ll, the two loops should fall into
the last case due to loop rotations. And I think we should handle that case.
I propose to check the dominance relation between loop predecessor blocks
of the two loops if there is no dominance relation between their loop
headers just like case three. The only thing I'm not pretty sure is that is
there guarantee to
1999 Feb 09
1
Robust estimate of variance
Has anybody written or located a robust verion of Var(X)?
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2006 Jan 19
1
nls profiling with algorithm="port" may violate bounds (PR#8508)
[posted to R-devel, no discussion:
resubmitting it as a bug, just so it gets
logged appropriately]
Sorry to report further difficulties with
nls and profiling and constraints ... the problem
this time (which I didn't check for in my last
round of testing) is that the nls profiler doesn't
seem to respect constraints that have been
set when using the port algorithm.
See test code
2010 Oct 08
1
Trapezoid Rule
Dear R Users,
I've never used R before and my professor has asked us to do some
pretty intense programming (or it's intense to me at least). Here is
the question: Modify the function myquadrature inside the script so
that it returns the quadrature of descrete data using the trapezoidal
rule. Modify the call to the function at the bottom of the script so
that is uses your modifies
2002 Apr 26
4
Memory "leak" in readChar (PR#1483)
Full_Name: Hugh C. Pumphrey
Version: 1.4.1
OS: Linux (Debian Woody)
Submission from: (NULL) (129.215.133.170)
The function readChar() appears to have some type of problem with memory
allocation.
I don't know if "memory leak" is the correct term but if one uses readChar()
many
times, the R binary grows in size until it eats all your memory and swap space.
The code enclosed below
2009 Jan 20
2
plotting points with two colors
Dear Miss R,
I am trying to plot a scatterplot in which the points (round) should
have two colors: half red and half blue (if you want: two half solid circles
put together. Can you please help me to realize this efficiently?
Thank you,
Best regards, Georg.
***************************************
Georg Ehret
Geneva University Hospital
Geneva, Switzerland
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2012 Feb 13
1
comment lines sometimes removed from a function on exit from internal R editor
Dear All -
The problem: comment lines in an R function (lines beginning with # ) are *sometimes* removed on leaving the R default editor (same with notepad).
I'm working on a Windows machine with R version 2.14.1.
An example is below. Couldn't find anything that seemed to relate to this in the Changelog. I don't recall encountering this behavior with previous versions of R. Any
2007 Mar 16
1
Idmap_rid differs on FreeBSD and SLES!
Hi,
I'm trying to setup some servers with Samba and Winbind. One of the
servers are both a Samba server and a NFS server so I want to have the
same ID:s on the files that I export with NFS. All users are all in one
AD domain.
The problem is that the Samba/NFS server are running SLES 10 and the
others are running FreeBSD 6.2 and they get different UID:s and GID:s.
All the FreeBSD servers are
2007 Aug 30
3
piecewise linear approximation
Dear list,
I have a series of data points which I want to approximate with exactly two
linear functions. I would like to choose the intervals so that the total
deviation from my fitted lines is minimal. How do I best do this?
Thanks!
Kamila
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