Displaying 20 results from an estimated 1000 matches similar to: "Model selection in nonstationary VAR"
2012 Dec 23
3
Spammer radhi
This happened two or three weeks ago and it's happening again.
Spammers are using Nabble to attack R-Help. The psts are signed radhi
and the posts' titles are taken from previous posts and therefore seem
authentic but all messages end with "click here". I suggest you don't.
And don't rply to this "radhi"
And again on a weekend.
Rui Barradas
2012 Mar 07
1
VECM simulation
Dear members,
I estimated a vector error correction model (VECM) using the "ca.jo"
function in package "urca". I need to simulate the estimated model using R.
I am aware how to simulate a VAR(p) model. Since the VECM is
in difference form, I can't modify the VAR simulation codes to VECM. May
one help me in this regard please?
Thanks
Mamush
[[alternative HTML version
2011 May 12
1
strength of seasonal component
Hi All,
a) Is it possible to estimate the strength of seasonality in timeseries
data. Say I have monthly mean prices of an ten different assets. I decompose
the data using stl() and obtain the seasonal parameter for each month. Is it
possible to order the assets based on the strength of seasonality?
b) which gives a better estimate on seasonality stl() or a robust linear
model like
2011 Jul 13
3
Colors in R
HI everyone,
I''m trying to assign colors to multiple lines in a graph. Problem is I don''t want to type in as many colors as there are lines....is there a way around this? In brief, I''m plotting the logratio for up to 60 samples and want a different color for each sample. Here is the code I''m using now..
Any help is greatly appreciated..
Best
LT
data <-
2011 Jun 07
2
About DCC-garch model...
Hi, everyone,
I currently run into a problem about DCC-Garch model. I use the package
cc-garch and the function dcc.estimation. One of the output of this function
is DCC matrix, which shows conditional correlation matrix at every time
period you gives. However, I cannot figue out how the function calculate the
conditional correlation matrix at the first time period, since there is no
data to be
2011 Jun 28
2
Running R from windows command prompt
1. I have a R program in a file say "functions.R".
I load the "functions.R" file the R using source("function.R") and then call
functionsf1(), f2() etc. which are declared and defined within "function.R"
file.
I also need to load a couple of R libraries using library() before I can
use f1(), f2() etc.
My question is can I acheive all this (i.e. calling
2012 Mar 21
3
how calculate seasonal component & cyclic component of time series?
i am new to time series,whatever i know up till now,from that
i have uploaded time series file & what to build arma model,but for that i
want p & q values(orders)
tell me how to calculate best p & q values to find best AIC values for model
i am doing but giving error
>bhavar<-read.table(file.choose()) #taking time series file
> decompose(bhavar$V1)
Error in
2018 Jan 05
0
Help with Regular expression
Hi Bogaso,
I see your ultimate goal is to extract the Date-time part from your
expression, then below should help :
> as.POSIXlt(gsub("[^0-9a-zA-Z]", "", "\":\"03-JAN-2018 16:00:00\""),
format = "%d%b%Y%H%M%OS")
[1] "2018-01-03 16:00:00 GMT"
_____________________________________________________
Arun Kumar Saha, FRM
2010 Jan 24
3
Display of results
Dear R-helpers,
I have been trying to carry out some variance ratio tests such as
Lo-MacKinlay test and Chow-Denning test. However, When I write the
function LM <- Lo.Mac(y,kvec)
or any other functions I don’t get the results displayed. The only
sign I get is <
I don’t understand what’s wrong (is it the package, misspecification
of the function, Vista). I am really stuck in and I would be
2005 Jun 28
2
STAR models estimation with R
Hi,
Can you tell me if there are an R package or code for STAR model estimation and test misspecification. If no, how i could do this.
Thanks in advance
Best regards
AJMI Noomen
Phd student
TUNISIA
---------------------------------
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2010 Sep 13
1
Problem (environment?) with R CMD CHECK
Hi all,
I have a package that contains a function foo that calls a function
.fooInternal via match.fun('.fooInternal'). This step is necessary
because I want to give the user an option to override .fooInternal
with a custom function. The .fooInternal function name is not
exported. The function foo runs perfectly well when used in a normal R
session. However, the function fails the R CMD
2006 May 11
3
Please help me to combine two datasets.
Dear r-users,
Suppose I have two data sets
data set-1
Date height
------------------------
1/11/2005 10
2/11/2005 23
3/11/2005 54
4/11/2005 21
5/11/2005 22
data set-2
weight
--------
32
45
11
Now I want to combine this two data sets. i.e. i want to see:
Date height weight
-------------------------------------------
3/11/2005 54
2008 Feb 26
2
Subsetting within xyplot()
All,
I'm having problems w/ a simple attempt to subset an xyplot.
The first plot below is a plot of y versus x for certain values of a third
categorical variable z. Now I'd like to further restrict this to certain
values of variable y. Neither of the two attempts below work. Any
suggestions much appreciated. (note: I don't want to merely use ylim since
I have a loess plot and I
2006 Feb 14
2
how I can perform Multivariate Garch analysis in R
Dear aDVISOR,
Hope I am not disturbing you. Can you tell me how I can perform Multivariate
Garch analysis in R. Also please, it is my humble request let me know some
resource materials on Multivariate Garch analysis itself.
Sincerely yours,
--
Arun Kumar Saha, M.Sc.[C.U.]
S T A T I S T I C I A N [Analyst]
Transgraph Consulting [www.transgraph.com]
Hyderabad, INDIA
Contact # Home:
2006 Jun 14
3
appending
All,
In the function below I have 24 individuals and 6 calculations per
individual.
The 6 calculations are collected each time in a 1:24 loop when
calculating "delta".
I'd like to collect all 144 = 24*6 calculations in one vector
("delta.patient.comb").
The function works as is via indexing, but is there an easier way to
collect the measurements via appendinng the 6
2007 Jan 20
3
Insert R logo
Dear all R users,
I want to insert the R logo in every graphic that I made in my Statistical
analysis using R. Can anyone tell me whether is it possible or not and if
possible how to do this? your help will be highly appreciated.
Thanks and Regards,
Arun
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2012 Sep 12
7
multinomial MCMCglmm
Dear all,
I would like to add mixed effects in a multinomial model and I am trying
to use MCMCglmm for that.
The main problem I face: my data set consits of a trapping data set,
where the observation at eah trap (1 or 0 for each species) have been
aggregated per traplines. Therefore we have a proportion of
presence/absence for each species per trapline.
ex:
ID_line mesh habitat Apsy Mygl
2007 Sep 18
5
Need help on "date"
Dear all,
I have a variable 'x' like that:
> x
[1] "2005-09-01"
Here, 2005 represents year, 09 month and 01 day.
Now I want to create three variables naming: y, m, and d such that:
y = 2005
m = 09
d = 01
can anyone tell me how to do that?
Regards,
[[alternative HTML version deleted]]
2012 May 07
1
Value of Hurst exponent (R/S) method > 1
Hello,
I'm using fArma package to estimate the value of Hurst exponent using R/S
method. However, for a certain set of data I get H ~ 1.8. How do I
interpret this?
Following are the output that I get for this set:
> mean(data[,2])
[1] 400.5433
> sd(data[,2])
[1] 1139.786
>
> rsFit(data[,2], levels = 64)
Title:
Hurst Exponent from R/S Method
Call:
rsFit(x = data[, 2], levels
2012 Oct 16
5
CentOS 6.3 on Dell Poweredge R815
Hi,
Any folks on this list who have installed CentOS 6.3 on the new Dell
Poweredge R815
servers? How was your experience? Thanks
-Surya
--
Surya Saha
Department of Plant Pathology
and Plant-Microbe Biology
Cornell University, NY, USA
http://www.linkedin.com/in/suryasaha