Displaying 20 results from an estimated 1000 matches similar to: "mean reverting model"
2012 Nov 13
2
Discrete trait Ornstein–Uhlenbeck in R?
Is there a package that will allow me to fit Brownian motion and
Ornstein?Uhlenbeck models of evolution for discrete traits? I know that
geiger and ouch have commands for fitting these models for continuous
traits, but these aren't suitable for discrete trait evolution, correct?
--
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2012 Jul 20
1
fitting Ornstein-Uhlenbeck process by MAXIMUM LIKELYHOOD
Dear friends
i am trying to fit an Ornstein-Uhlenbeck process by MAXIMUM LIKELYHOOD
method.
i found these formulas on
http://www.sitmo.com/article/calibrating-the-ornstein-uhlenbeck-model/
this is the mean-reverting process
http://r.789695.n4.nabble.com/file/n4637271/process.txt process.txt
and this is the script that i am using.......
ouFit.ML=function(spread) {
n=length(spread)
2007 Nov 28
1
simulating a 2-parameter integrated ornstein-uhlenbeck process?
hello everyone,
i'm trying to simulate a 2-parameter integrated ornstein-uhlenbeck (IOU) process, but i'm not sure exactly where to start (which package, which function). the motivation is the paper by taylor et. al. (JASA 1994) "a stochastic model for the analysis of longitudinal aids data." the model they suggest consists of a combination of fixed and random effects, a
2007 Sep 28
5
R-Server remotecontrolled via browser-GUI
dear r-community,
currently i have a workflow as following:
data in online-MYSQL-database via .csv into R for analysis, results
back to mysql.
generating graphics for reports also.
that's ok, but i need some process-optimization.
i'd like to run r directly on the webserver. analysis should work
automatically, after the appropriate r-script was selected in a
browser-gui for R.
until
2019 Apr 05
0
new R packages for phylogenetic compartive methods
Dear all,
I wanted to let you know about four phylogenetic comparative methods (PCM) packages that have become available on (3 on CRAN and 1 on GitHub) recently that hopefully will be interesting to somebody. Three of them go significantly beyond the Brownian motion (BM) and Ornstein-Uhlenbeck (OU) processes.
1) There is a new version of mvSLOUCH available. The most important change is that
the
2019 Apr 05
0
new R packages for phylogenetic compartive methods
Dear all,
I wanted to let you know about four phylogenetic comparative methods (PCM) packages that have become available on (3 on CRAN and 1 on GitHub) recently that hopefully will be interesting to somebody. Three of them go significantly beyond the Brownian motion (BM) and Ornstein-Uhlenbeck (OU) processes.
1) There is a new version of mvSLOUCH available. The most important change is that
the
2006 Oct 27
1
Error using "White-corrected" Anova (white.adjust="hc3")
Hello.
I try to compute a "White-corrected" ANOVA. Therefore I use the command "Anova" implemented in the car()-package):
Anova(modelname, white.adjust="hc3")
and receive the error message:
"Fehler in SS[i] <- SS.term(names[i]) : nichts zu ersetzen" (German)
"Error in SS[i] <- SS.term(names[i]) : nothing to replace" (probably being the
2009 Feb 27
3
question about 3-d plot
Hi R Users,
I have produced a simulated scatter plot of y versus x tightly clustered
around the 45 degree line through the origin with the following code:
x <- seq(1,100)
y <- x+rnorm(100,0,10)
plot(x,y,col="blue")
abline(0,1)
Is there some way to generate a 3-dimensional analogue of this? Can I get a
similar simulated scatter plot of points in 3 dimensions where the points
2010 Jul 06
3
Function for gruping similar variables?
Hi,
I have a matrix of results of multiple 2x2 chi^2 tests, non-
significant tests are marked as TRUE. Is there a function for grouping
those variables in a similar way LSD.test from agricolae library does?
I reviewed LSD.test's source but it's not helpful for me.
This is my matrix:
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
1 TRUE FALSE TRUE TRUE TRUE FALSE TRUE
2 FALSE TRUE
2007 May 31
0
adehabitat version 1.6
Dear all,
I have just uploaded to CRAN the version 1.6 of the
package 'adehabitat'. Significant changes are
listed below:
* The package has been reorganized into four parts (see
?adehabitat-package for a description): (i) management of raster maps,
(ii) habitat selection / ecological niche analysis, (iii) home range
analysis, and (iv) analysis of animals trajects. The package contains
2007 May 31
0
adehabitat version 1.6
Dear all,
I have just uploaded to CRAN the version 1.6 of the
package 'adehabitat'. Significant changes are
listed below:
* The package has been reorganized into four parts (see
?adehabitat-package for a description): (i) management of raster maps,
(ii) habitat selection / ecological niche analysis, (iii) home range
analysis, and (iv) analysis of animals trajects. The package contains
2011 Mar 18
2
Need help with error
Hi R users,
I am getting the following error when using the splsda function in R
v2.12.1:
"Error in switch(classifier, logistic = { : EXPR must be a length 1
vector"
What does this mean and how do I fix this?
Thank you in advance!
Best,
Savi
2009 Jun 08
2
Tinn R
Dear R-users,
I have installed the latest version of Tinn R (Version 2.2.0.2).
With the older versions it was possible to run Tinn R next to R and then select code that one could send to R.
Now it seems that one has to start the R gui in Tinn R and then it is possible to select en run code of R.
But if I start R within Tinn R it does NOT start the R-Gui but only the R console. When I start R
2008 Dec 10
2
missing argument
Dear list,
I have a question and I'm going to give an example of my problem
f<- function(d1, d2, d3)
{
d<- d1*d2/d3
return(d)
}
v1<- 1
v2<- 2
If I try
f(v1, v2, v3)
Error in f(v1, v2, v3) : object "v3" not found
I obviously got the above error message.
I would like to add something to my function to allow me to get a certain
value (say zero)
if one of the arguments is
2011 Aug 29
2
rpart: apply tree to new data to get "counts"
Hi,
when I have made a decision tree with rpart, is it possible to "apply"
this tree to a new set of data in order to find out the distribution
of observations? Ideally I would like to plot my original tree, with
the counts (at each node) of the new data.
Reagards,
Jay
2001 Dec 17
1
environments again
In a previous message I was not clear enough in my querry.
I have the following program:
tst<- function() {
x <- c(32.7,32.3,31.5,32.1,29.7,29.1,35.7,35.9,33.1,
36.0,34.2,31.2,31.8,28.0,29.2,38.2,37.8,31.9,
32.5,31.1,29.7)
g <- rep(1:7,rep(3,7))
s <- rep(1:3,7)
cat(" Only x and g \n")
aov1(x,g)
cat("\n\n Now x, g and s \n")
aov1(x,g,s=s)
}
2009 Jul 18
3
how to run the R script in background in Windows XP?
Hello ,everyone.
I am a fresh user of R. I wrote several several R script in R with the
version 2.9.1 in Windows XP. But I only can run these scrpit via R-GUI.
Can anyone tell me how to run the scripts in background without openning
R-gui.In another word, run the R-script and get the result via
some batch proceesing files or shell scripts directly?
Thanks.
.
--
TANG Jie
Email:
2009 May 08
3
'Dynamic' 3D plot
Hi,
I am looking for a R package to draw 3d plot. But not in a static way like scatterplot3d or stuff like that. I would like to make rotate the plot, to zoom/unzoom etc..., actually to render the graph 'dynamic'... (for the biologist and bioinformatician, a R package which permitts to reproduce what pdb viewer does).
Does a Way exist to do something like that in R ?
Thanks,
2008 Dec 15
5
how to create duplicated ID in multi-records per subject dataset
Hi R helpers,
If I have a dataset looks like:
ID record
1 20
. 30
. 25
2 26
. 15
3 21
4.....................
And I want it becomes
ID record
1 20
1 30
1 25
2 26
2 15
3 21
4.....................
That is, I have to duplicate IDs for those with multiple records. I am wondering it is possible to be
2008 May 10
3
Compact Indicator Matrices
An indicator matrix is a binary matrix with orthogonal columns whose
rows sum to 1. A row of this matrix could be [0 1 0 0]. My problem is
to group the similar rows (profiles) so that to create a compact form
of the matrix.
Is there an R function that deals with this problem or do I have to
write it from scratch?
Thanks,
Angelos Markos
Dr. Applied Informatics,
University of Macedonia, Greece