Displaying 20 results from an estimated 300 matches similar to: "Unit root"
2008 Feb 26
2
Obtaining values from adfstat objects
Hi,
I'm using the ADF.test function in the uroot package to obtain an
adfstat-class object. I'm wondering how I can extract the values (test
statistic, p value, etc.) from this class, since it doesn't seem to have
usual values. I get the following summary, but I'm not sure how to do
anything with these values -- how can I put the number into another
variable?
--------- ------ -
2007 Feb 13
0
adf test: trend, no drift - rep: invalid 'times' argument
Hello!
I am applying the ADF.test function from package uroot to a time series of data. When I apply the full test, incorporating drift and trend terms, the regressor estimate of the drift term is not significantly different from zero. So I apply the test to a model without drift term, with deterministic trend only. But then I always get the following error:
2012 Feb 03
1
A question on Unit Root Test using "urca" toolbox
Hello,
I have a question on unit root test with urca toolbox.
First, to run a unit root test with lags selected by BIC, I type:
> CPILD4UR<-ur.df(x1$CPILD4[5:nr1], type ="drift", lags=12, selectlags ="BIC")
> summary(CPILD4UR)
The results indicate that the optimal lags selected by BIC is 4.
Then I run the same unit root test with drift and 4 lags:
2010 Aug 23
1
Dickey–Fuller test in R
Hi,
While doing the adf test using ur.df
?price.df2=ur.df(y=log(price),type = "drift", selectlags="AIC")
summary(price.df2)?
It gives two values for ?value of test statistic is: -1.5992?? 2.32?
one value is the t-test (or t-ratio), what is the other one?
Please help.
TIA
Aditya
2009 May 15
1
Dickey-Fuller Tests with no constant and no trend
R has a Dickey-Fuller Test implementation (adf.test) that tests for unit
roots in an autoregressive process with a constant and linear trend. Is
there a DF implementation that doesn't use the constant or trend?
Thanks,
Jake.
--
View this message in context: http://www.nabble.com/Dickey-Fuller-Tests-with-no-constant-and-no-trend-tp23565210p23565210.html
Sent from the R help mailing list
2008 May 19
0
[ wxruby-Bugs-20245 ] position_to_xy always returns nil in OSX
Bugs item #20245, was opened at 2008-05-19 12:51
You can respond by visiting:
http://rubyforge.org/tracker/?func=detail&atid=218&aid=20245&group_id=35
Category: Incorrect behavior
Group: current
Status: Open
Resolution: None
Priority: 3
Submitted By: Nobody (None)
Assigned to: Nobody (None)
Summary: position_to_xy always returns nil in OSX
Initial Comment:
Tested under OsX Leopard,
2011 Oct 22
0
covariance matrix of model parameters
I am applying a hidden markov model on joint multivariate gaussian
distribution for 2 vectors. I am using the depmixS4 package in R.
Specifically, I am using the following code:
mod<-depmix(list(response = mom ~ mkt + p0 + p1, mkt~1), data = regvar,
nstates = 2,
family = list(gaussian(), gaussian()),instart = delta, trstart=Pi)
It seems that depmixS4 doesnt output the covariance estimates
2013 Apr 30
1
ADF test --time series
Hi all,
I was running the adf test in R.
CODE 1:
adf.test(data$LOSS)
Augmented Dickey-Fuller Test
data: data$LOSS
Dickey-Fuller = -1.9864, Lag order = 2, p-value = 0.5775
alternative hypothesis: stationary
CODE 2:
adf.test(diff(diff(data$LOSS)))
Augmented Dickey-Fuller Test
data: diff(diff(data$LOSS))
Dickey-Fuller = -6.9287, Lag order = 2, p-value = 0.01
alternative
2010 Oct 29
3
Dickey Fuller Test
Dear Users, please help with the following DF test:
=====
library(tseries)
library(timeSeries)
Y=c(3519,3803,4332,4251,4661,4811,4448,4451,4343,4067,4001,3934,3652,3768
,4082,4101,4628,4898,4476,4728,4458,4004,4095,4056,3641,3966,4417,4367
,4821,5190,4638,4904,4528,4383,4339,4327,3856,4072,4563,4561,4984,5316
,4843,5383,4889,4681,4466,4463,4217,4322,4779,4988,5383,5591,5322,5404
2007 Dec 08
2
time series tests
Hi all,
Can anyone clear my doubts about what conclusions to take with the following what puts of some time series tests:
> adf.test(melbmax)
Augmented Dickey-Fuller Test
data: melbmax
Dickey-Fuller = -5.4075, Lag order = 15, p-value = 0.01
alternative hypothesis: stationary
Warning message:
p-value smaller than printed p-value in: adf.test(melbmax)
2010 Feb 17
0
adf.test help
Hi,
I am trying to test whether a series is return series stationary, but
before proceeding I wanted to make sure I understand correctly how to
use the adf.test function and interpret its output... Could you please
let me know whether I am correct in my interpretations?
ex: I take x such as I know it doesn't have a unit root, and is
therefore stationary
1/
> x <- rnorm(1000)
>
2013 Jun 23
1
Scaling Statistical
Short question: Is it possible to use statistical tests, like the Augmented
Dickey-Fuller test, in functions with for-loops? If not, are there any
alternative ways to scale measures?
Detailed explanation: I am working with time-series, and I want to flag
curves that are not stationary and which display pulses, trends, or level
shifts.
>df
DATE ID VALUE2012-03-06 1
2004 Jan 14
0
How can I test if a not independently and not identicallydistributed time series residuals' are uncorrelated ?
I'm analizing the Argentina stock market (merv)
I download the data from yahoo
library(tseries)
Argentina <- get.hist.quote(instrument="^MERV","1996-10-08","2003-11-03", quote="Close")
merv <- na.remove(log(Argentina))
I made the Augmented Dickey-Fuller test to analyse
if merv have unit root:
adf.test(merv,k=13)
Dickey-Fuller = -1.4645,
2014 Jan 13
1
force samba4 DC not to add all interfaces IP's to DNS?
Hi
I have a samba4 DC which also provides same KVM virtualisation services.
During provision all IP numbers of all network interfaces where added to DNS, even the private KVM brigde Interfaces.
Therefore clients which ask the DNS for AD-DNS records often get the IP of a an interface as answer, which is not reachable.
This slows down things like login etc.
I removed the DNS entries of the
2018 Jun 09
0
Problem with named.service
Good Afternoon!
I had thinking that maybe is a permissions problem.
Then, here the files permissions:
[root at pc ~]# ls -l /etc/resolv.conf-rw-r--r--. 1 root root 78 Jun 7 17:32 /etc/resolv.conf------------------------------------------------------------------------------
[root at pc ~]# ls -l /etc/hosts-rw-r--r--. 1 root root 193 Dec 4 2017 /etc/hosts
2008 Dec 08
1
About adf.test
Dear sir,
I am a new user of R statistical package. I want to perform
adf.test(augmented dickey fuller test), which packages I need to install in
order to perform it. I am getting following message on my monitor.
*x<-rnorm(1000)
> adf.test(x)
Error: could not find function "adf.test"
*I am waiting for your response.
Kamlesh Kumar.
--
Kamlesh Kumar
Appt. No. - QQ420,
2008 Apr 04
1
Problems with Unit Root testing using ur.df function
Hi All,
I'm new to R and am trying to run a unit root test on the vector "y" (a time
series of inflation (i.e. changes in the Consumer Price Index quarter on
quarter)).
I've run the Augmented-Dickey-Fuller Test below (R's URCA package). It gives
me an error that it cannot find the function ur.df unless I comment out the
third last line of code (see below).
I try to call
2009 Jun 05
1
ADF test
Hi,
While doing the ADF test in R using the following command I am getting the
error and the result..">
x.ct=ur.df(rev$REVENUE,start=1,end=length(rev$REVENUE),frequency=1)
Error in ur.df(rev$REVENUE, start = 1, end = length(rev$REVENUE), frequency
= 1) :
unused argument(s) (start = 1, end = 4, frequency = 1)
>
2009 Mar 20
1
Dickey Fuller test of a time series (problem)
Hi all,
I tried to do a Dickey Fuller test with R using adf.test with a time series of german stock prices. I have 10 stocks from 1985 to 2009 with monthly stock prices. So if you do the math I have 289 values for each stock.
I tried to do the test for each stock alone and had the 289 values of my first stock listed in R.
When I tried to do the test with command adf.test(x, k=1) the following
2020 Oct 28
1
segfault during net rpc printer migrate drivers
Hi
I am trying to migrate an old printserver from one samba4 (4.8.11 on
CentOS-6) server to a newer one (4.11.2 on CentOS-8)
using
net rpc printer migrate all
The migration of queue, forms, securitty, settings works, during the
migration of the drivers (net rpc printer migrate drivers)? the command
dumps core at the first driver
Here a level10 output
???? spoolss_AddPrinterDriver: struct