Displaying 19 results from an estimated 19 matches similar to: "forecast ARMA(1,1)/GARCH(1,1) using fGarch library"
2008 Dec 30
1
A mistake in garchFit()? {fGarch}
Hello,
I was using garchFit {fGarch} to fit some GARCH processes.
I noticed that the result contains "Log Likelihood" value (right above
"Description"), but when I use .. at fit$llh to retrieve Log Likelihood value,
the sign switched.
I am confused about which value I should choose to report...
Any help here?
Thanks a lot!
Ted
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2010 Jul 14
0
fGarch: garchFit() with fixed coefficents
hello everybody,
I would like to fit a model to a times series (testing set) for out of
sample predictions using garchFit(). I would like to keep the coefficients
of ARMA/GARCH model fixed (as found by fitting the model to my training
set). The arima fitting function has such an option for that (fixed=NULL)
but the garchFit() doesnt.
It is very important for me to keep the same coefficients
2009 Mar 03
0
Monte carlo simulation in fGARCH
I use fGarch package to estimate AR(1)-ARCH(1) process for a vector of returns. Then, using the estimated parameters I want to simulate 10 000 sample paths where each path has the same length as the vector of returns. So the first line of the code is: spec=garchSpec(model=list(ar= 0.440270860, omega=0.000374365,alpha=0.475446583 , mu=0, beta=0))----
The only way I can think of generating 10 000
2011 Jan 31
0
Applying previously fitted fGarch model
Greetings,
Suppose I fit an fGarch model via garchFit function for a time series X.
I'm wondering is there any easy way to apply the fitted model to a different
time series Y to calculate conditional variances and standardized residuals?
Thanks.
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2009 Jun 30
1
garchFit in fGarch fitted values are all the same
Dear all-
Package /fGarch/ version 2100.78 in R version 2.8.1 (2008-12-22)
running on linux 2.6.22.9-91.fc7
In trying to fit garch models in above environment. I am getting
"reasonable" fitted coefficients, but the fitObject@fitted are all the
same. This is true even for the help page example:
library(fGarch)
R> X.timeSeries = as.timeSeries(msft.dat)
R> head(
+
2011 Nov 06
0
fGarch: garchFit and include.shape/shape parameters
Hello,
The function garchFit in the package fGarch allows for choosing a
conditional distribution, one of which is the t-distribution. The function
allows specification of the shape parameter of the distribution (equal to
the degrees of freedom for the t-distribution), for which the default is set
to 4. The function also includes an option "include.shape", which is "a
logical flag
2010 Aug 15
2
fGarch: how to use garchFit() in loop?
Dear expeRts,
How can I specify the order p,q of a GARCH(p,q) model within a loop? Here's a minimal example showing that an "Formula and data units do not match"-error appears:
library(fGarch)
spec <- garchSpec(model = list(alpha = 0.1, beta = c(0.4, 0.4)))
data <- garchSim(spec, n = 100)
x <- list()
for(q in 1:3){
print(q)
x[q] <-
2009 Feb 17
1
R crash after fGarch update
Hi folks!
After updating my packages my R seems to have completely crashed as will not
start up - even after I installed 2.8.1 from 2.8.0.
I get the following:
Fatal error: unable to restore saved data in .Rdata
Error in loadNamespeace(name): there is no package called fGarch
But I do have a package called fGarch.
After I hit ok, it crashes and exits. I cannot use any functionality at
all.
2009 Apr 06
1
Problem with Extracting Fitted Values from fGarch package
Good day everyone,
I fitted a GARCH model to a time series and R estimated the model and provide me with the estimates. However, when I tried to extract the fitted values from the estimated model I got the following error message:
"Error in .local(object, ...) : object "fit" not found"
I used the following to extract the fitted values
fitted_TASI <- fitted(garchFit(~
2011 Jul 27
0
problems with predict in fGarch
Hello I am trying to use predict from an arma-Garch model (arma(2, 2) +
garch(1, 1)) and I am getting the following error:
Error en arima(x = object@data, order = c(max(u, 1), 0, max(v, 1)), init =
c(ar, :
non-stationary AR part from CSS
Does anybody know what can be the reason of this error? The model I have
estimated is the following:
Title:
GARCH Modelling
Call:
garchFit(formula =
2011 Sep 28
1
fGarch - Fitting and APARCH-Modell with fixed delta
Hi there,
I'm trying to fit a GJR-GARCH Model using fGarch. I wanted to try that by
fitting an APARCH model with a fixed delta of 2 and a non-fixed gamma. So I
was simply trying to use:
spec <- garchFit(~aparch(1,1),data=garchSim(),delta=2)
coef(spec)
And sometimes, it's working like a charm and delta is indeed exactly 2 in
the resulting coefficient vector.
Frequently, though, the
2011 Mar 24
1
Problems with predict in fGarch
Hello. I am using fGarch to estimate the following model:
Call:
garchFit(formula = fmla, data = X[, i], trace = F)
Mean and Variance Equation:
data ~ arma(1, 1) + garch(1, 1)
Conditional Distribution:
norm
Coefficient(s):
mu ar1 ma1 omega alpha1 beta1
-0.94934 1.00000 -0.23211 54.06402 0.45709 0.61738
Std. Errors:
based on Hessian
Error Analysis:
2011 May 04
1
fGarch
Hi,
I am attempting to fit a ARMA/GARCH regression model without success.
### ARIMA-GARCH model with regressor ###
### Time series data: A multivariate data set.
cov.ts.dq = cov.ts[1:4,"dq1"][!is.na(cov.ts[,"dq1"])]
cov.ts.day = ts.intersect(dq = diff(q.ts), day = lag(q.ts, -1))
### The following R scripts work:
(summary(no.day.fitr <- garchFit(dq ~ arma(0,3) +
2013 Aug 22
1
Strange ogginfo result
Hi!
I'm using the opus-tools package from the current Debian (it says it is
0.1.2). The output of opusinfo is strange:
$ opusinfo demo01.opus
Processing file "demo01.opus"...
New logical stream (#1, serial: 0000456a): type opus
Encoded with libopus 1.0.1-rc3
User comments section follows...
ENCODER=opusenc from opus-tools 0.1.5
Opus stream 1:
Pre-skip: 356
Playback
2004 Sep 02
0
Two xtable Questions
Hi,
These are two problems I've never seen when I used xtable() before...
R 1.9.1 for Windows XP, xtable version 1.2-3:
> final.df
Loci Chr Marker Position P.values Deviance DF
1 Idd5 1 D1Mit181 42.6 0.0011 103.21 78
2 Idd6/19/20 6 D6Mit374 66.7 0.0014 104.29 78
3 Idd13 2 D2Mit490 64.5 0.0025 97.83 78
4
2015 Oct 25
0
Isohybrid wiki page and UEFI
Hello,
Gene Cumm said on Thu, Oct 22, 2015 at 06:39:44PM -0400:
>On Thu, Oct 22, 2015 at 1:56 PM, Bruno Cornec via Syslinux
><syslinux at zytor.com> wrote:
>
>> 3/ Using syslinux.efi in a FAT32 image (similar to the previous 2
>> confs) stored on a iso9660 media by genisoimage and its
>> -eltorito-alt-boot -efi-boot $imagefile -no-emul-boot option doesn't
2015 Oct 25
2
Isohybrid wiki page and UEFI
> Hello,
>
> Gene Cumm said on Thu, Oct 22, 2015 at 06:39:44PM -0400:
> >On Thu, Oct 22, 2015 at 1:56 PM, Bruno Cornec via Syslinux
> ><syslinux at zytor.com> wrote:
> >
> >> 3/ Using syslinux.efi in a FAT32 image (similar to the previous 2
> >> confs) stored on a iso9660 media by genisoimage and its
> >> -eltorito-alt-boot -efi-boot
2015 Oct 22
2
Isohybrid wiki page and UEFI
On Thu, Oct 22, 2015 at 1:56 PM, Bruno Cornec via Syslinux
<syslinux at zytor.com> wrote:
> 3/ Using syslinux.efi in a FAT32 image (similar to the previous 2
> confs) stored on a iso9660 media by genisoimage and its
> -eltorito-alt-boot -efi-boot $imagefile -no-emul-boot option doesn't
> work. I get a red screen with debug info (attached). However, I'm not
>
2007 Aug 22
5
Slow concurrent actions on the same LVM logical volume
Hi 2 all !
I have problems with concurrent filesystem actions on a ocfs2
filesystem which is mounted by 2 nodes. OS=RH5ES and OCFS2=1.2.6
F.e.: If I have a LV called testlv which is mounted on /mnt on both
servers and I do a "dd if=/dev/zero of=/mnt/test.a bs=1024
count=1000000" on server 1 and do at the same time a du -hs
/mnt/test.a it takes about 5 seconds for du -hs to execute:
270M