Displaying 20 results from an estimated 1000 matches similar to: "robust regression"
2011 Dec 06
2
Why can't I figure this out? :S
Hi, so I don't speak computer and I have no idea what this code is telling
the program to do, but I apparently need to be able to find and isolate
influencial observations. Problem, I have no idea what the error means and
where it may be from in the code.
error I get is below the code
{
## OLS results
NameC<- lm(gpanew~female+female:lastinit+agenew+canadian+mom_ed+yearstudy)
## default:
2003 Feb 10
2
problems using lqs()
Dear List-members,
I found a strange behaviour in the lqs function.
Suppose I have the following data:
y <- c(7.6, 7.7, 4.3, 5.9, 5.0, 6.5, 8.3, 8.2, 13.2, 12.6, 10.4, 10.8,
13.1, 12.3, 10.4, 10.5, 7.7, 9.5, 12.0, 12.6, 13.6, 14.1, 13.5, 11.5,
12.0, 13.0, 14.1, 15.1)
x1 <- c(8.2, 7.6,, 4.6, 4.3, 5.9, 5.0, 6.5, 8.3, 10.1, 13.2, 12.6, 10.4,
10.8, 13.1, 13.3, 10.4, 10.5, 7.7, 10.0, 12.0,
2004 Nov 11
1
RSPerl problem with testing
Hi,
I'm trying to install de RSPerl module and i have some problems trying
to test it. I've tried to contact with the author but the e-mail address
seems not to exist. Hope that anyone in this list could explain me a
little about this problem. I have a bash shell and what i do is the
following:
#PERLLIB=/usr/lib/R/library/RSPerl/share/blib/arch:/usr/lib/R/library/RSPerl/share/blib/lib
#
2012 Jan 26
1
Error in ifelse(append, "a", "w") : , (list) object cannot be coerced to type 'logical'
Hello
I will appreciate your help with the following.
Running a script in R 2.14.1 under windows vista I get the following error
message:
Error in ifelse(append, "a", "w") :
(list) object cannot be coerced to type 'logical'
However, the very same script runs perfectly well under Ubuntu.
My understanding is that this type of error is associated to
2012 May 23
1
procrustes (vegan) plot of residual differences
Hello
This is a simple question but I couldn't google an answer.
In the procrustes function of the vegan package, one uses
plot(procrustes_object, kind=2) to obtain a plot of the residual
differences. For instance:
data(varespec)
vare.dist <- vegdist(wisconsin(varespec))
library(MASS)
mds.null <- isoMDS(vare.dist, tol=1e-7)
mds.alt <- isoMDS(vare.dist,
2006 Oct 22
1
least median squares
Does anyone can provide a code to implement least median squares
regression in R (not using the lqs function or calling C functions)?
Reason: teaching/learning purposes
Thanks
PM
2000 Dec 05
1
Is robust regression available in R.
Hello, the R people.
I look for robust regression in R.
This method is available in S, its name is rreg.
Colud anyone teach me ?
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2005 Oct 06
0
a question about LMS and what constitutes outliers
Hi,
I have been using the lqs function with method='lms'. However the
results I get are a little different from the results noted by Rousseeuw
& Leroy (Robust Regression and Outlier Detection) and I was wondering
how to use these results for outlier detection.
I'm using the stackloss dataset, for which the original Rousseeuw et al.
program points out that observations 1,2,3,4
2000 Dec 12
1
[Fwd: R code and robust regression]
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2007 Jan 04
2
Making Home Directory available for Windows Users
Hello,
Situation:
We are in a school class every student logs on with the same account. Until
now we had Shares that were accessable for everybody and it was therefore
possible to look into and edit/delete other's files.
Plan:
Create a share that can be clicked on which then asks for User/Pass and
directly maps to the User's home Directory upon auth. User auth is done
through LDAP
2003 Nov 14
1
What goodness-of-fit measure for robust regression ?
Hi,
i. After estimating some coefficients using robust regression with rlm() or lqs(), I wonder if there exist some measures of the goodness-of-fit as those for standard linear model(R2)... or evenly if it's a statistics non-sense to look for since I do not find any mention of that in differents chapters on robust and resistant regression or in severals R documentation (Fox, Ripley and
2003 Nov 13
3
conf int mixed effects
Hi,
I have a linear mixed-effects model object and want to extract the 95%
confidence intervals for the fixed and random effects, respectively. I
found the function intervals() for confidence intervals for the fixed
effects but no corresponding function for the random effects. Does it
exist or do I have to calculate the confidence intervals for the random
effects myself?
Greetings,
joerg
2004 Apr 14
7
trend turning points
Hi,
does anybody know of a nice test to detect trend turning points in time
series? Possibly with reference?
Thanks,
joerg
2004 Mar 24
2
wolfinger microarray normalization
Hi,
concerning my earlier mail, maybe someone has noted from the variable names
that I try to analyse mircoarrary experiments.
Does anybody know of a R-implementation of the two-step mixed-model
normalization procedure proposed by
Wolfinger et al. (2001) J. Comput. Biol. 8:625-637?
That would be great,
best,
joerg
2012 Jul 13
2
significance test interquartile ranges
Hi,
I have two non-normal distributions and use interquartile ranges as a dispersion measure.
Now I am looking for a test, which tests whether the interquartile ranges from the two distributions are significantly different.
Any idea?
Thanks,
joerg
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1999 Feb 09
1
Robust estimate of variance
Has anybody written or located a robust verion of Var(X)?
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2007 Oct 04
1
Updating packages for R 2.6.0
Since this has come up already:
It is a good idea to re-install all packages for a minor-version increment
of R, e.g. 2.5.1 -> 2.6.0 (it is major.minor.patchlevel). This is most
easily done by
> update.packages(checkBuilt=TRUE, ask=FALSE)
However, if you don't want to do that yet, be aware that
- Certain S4-using packages must be reinstalled, and using old versions
can make R
2011 Apr 18
1
XML Packge for Windows XP and R 2.12.
Hello,
I am looking for the XML Package for Windows or any package, which would
enable me to use the function "xmlTreeParse". In a thread dating from
2001, the same question is raised:
>>Griffith Feeney wrote:
>>
>> Has anyone gotten the XML package (R News 1-1:24) with R running on
Windows
>> (95 or 98 or 2000)? I've looked at the omegahat, expat and libxml
2002 Jan 22
1
documentation and plotting with lqs
Dear r-help,
Is there any available description of the components of lqs objects
found in the package "lqs"?
> names(slts)
[1] "crit" "sing" "coefficients" "bestone"
[5] "fitted.values" "residuals" "scale" "terms"
[9] "call"
2011 Nov 21
4
Discarding a matrix based on the rowSums value
Hello
I would appreciate your help on the followig. I want to generate random
binary matrices but I need to discard those with all-1 rows. That is, for a
10x10 matrix with five 1's
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 0 0 0 0 0 0 0 0 0 1
[2,] 0 0 0 0 0 0 1 0 0 0
[3,] 0 0 0 0 0 0 1