Displaying 20 results from an estimated 120 matches similar to: "Forecast Package in R: auto.arima function"
2010 Jun 25
1
Confused: Looping in dataframes
Hey,
I have a data frame x which consists of say 10 vectors. I essentially want
to find out the best fit exponential smoothing for each of the vectors.
The problem while I'm getting results when i say
> lapply(x,ets)
I am getting an error when I say
>> myprint
function(x)
{
for(i in 1:length(x))
{
ets(x[i],model="AZZ",opt.crit=c("amse"))
}
}
The error message is
2010 Jun 28
1
Exponential Smoothing: Forecast package
Hey,
I am using the ets() function in the forecast package to find out the best
fit parameters for my time-series. I have about 50 sets of time series data.
I'm currently using the function as follows:
ets(x,model="AZZ",opt.crit="mse")
As to my observation about 5-10 of them have been identified by ets to have
a trend and an alpha, beta values have been thrown up -
2011 Dec 17
0
auto.arima from the Forecast package
Hi,
I've got a little problem using auto.arima.
I run the following command
auto.arima(drivers,ic="aic",d=1,D=1,max.order=10,max.p=5,max.q=5,max.P=5,max.Q=5,stepwise=FALSE,allowdrift=FALSE)
and I get the following output :
Series: drivers
ARIMA(0,1,1)(5,1,1)[12]
Coefficients:
ma1 sar1 sar2 sar3 sar4 sar5 sma1
-0.6421
2000 Jan 31
2
glm
I've downloaded R for windows (9.0.1) and it is great! I've
converted all my lecture notes for my GLM course to run on R (they are
available on my web page below). I must admit I particularly like the
default contrast options, which are identical to GLIM. Also I like the
gl function - very useful! I have a couple of questions/bugs:
1. predict.glm doesn't work, but predict.lm does -
2010 Jun 22
1
Applying forecast functions to columns in a data frame
Hey,
I have a list of 30 odd time-series (products) in columns of a data-frame.
I want to apply time-series forecasting functions across all the columns of
the data-frame in order to determine which is the best model to use.
How do I go about this?
Phani
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2011 May 10
0
Series temporales
Hola Jorge:
Disculpa la tardanza pero me han tenido liado en otros menesteres. Yo no
soy ni muchísimo menos un experto ni en series temporales ni en R de hecho
retomo el tema después de muchos (demasiados) años aparcado y dedicándome
a labores de programación pura y dura.
Respecto a la diferencia de resultados con R y Statgraphics, no conozco el
proceso de selección del modelo ARIMA que hace
2008 Mar 18
0
Trouble fitting models with nonNULL datadist in Design Library
Having trouble with datadist in the Design library. When I set the
datadist option, all of the fitting functions give error messages
similar to "Error in exists(x, envir, mode, inherits) : invalid first
argument". Code below was run in R version 2.5.0 under windows, but get
similar results with R version 6.2, except with additional problem that
it will not fit model with
2012 Oct 04
1
Is there any package for Vector Auto-regressive with exogenous variable other than fastVAR?
Is there any package for Vector Auto-regressive with exogenous variable other
than fastVAR?
Because it is not able to solve my problem of not taking the base in the
model.
Please suggest some appropriate solution!!!!
--
View this message in context: http://r.789695.n4.nabble.com/Is-there-any-package-for-Vector-Auto-regressive-with-exogenous-variable-other-than-fastVAR-tp4644964.html
Sent from
2011 Jun 16
1
prediction intervals
Dear members,
I'm fitting linear model using "lm" which has numerous auto-regressive terms as well as other explanatory variables. In order to calculate prediction intervals, i've used a for-loop as the auto-regressive parameters need to be updated each time so that a new forecast and corresponding prediction interval can be calculated.
I'm fitting a number of these models
2003 Dec 30
1
odd results from polr vs wilcoxon test
Dear R helpers,
I would like to ask why polr occasionally generates results that look very
odd.
I have been trying to compare the power of proportional odds logistic
regression with
the Wilcoxon test. I generated random samples, applied both tests and
extracted and
compared the p-values, thus:-
library(MASS)
c1=rep(NA,100); c2=c1
for (run in 1:100)
{
dat=c(rbinom(20,12,0.65),rbinom(20,12,0.35))
2009 Feb 09
1
gee with auto-regressive correlation structure (AR-M)
Dear all,
I need to fit a gee model with an auto-regressive correlation structure and I faced some problems.
I attach a simple example:
#######################################################
library(gee)
library(geepack)
# I SIMULATE DATA FROM POISSON DISTRIBUTION, 10 OBS FOR EACH OF 50 GROUPS
set.seed(1)
y <- rpois(500,50)
x <- rnorm(500)
id <- rep(1:50,each=10)
# EXAMPLES FOR
2008 Dec 19
0
How to plot arrows for a PLS plot with ggplot2?
Dear community,
I'd like to build a PLS plot with scores and loadings, sometimes
called "biplot". Like in biplot.mvr {pls} but using ggplot2.
1. Scores plot. No problem!
ggplot(data=data1,aes(x=plsr1,y=plsr2))+geom_point(aes(colour=solenergy,shape=type))+geom_text(aes(label=res,size=1,hjust=0,vjust=0))
where,
> str(data1)
'data.frame': 295 obs. of 5 variables:
$
2010 Aug 23
2
Fitting VAR and doing Johansen's cointegration test in R
Hi,
Could someone please tell me the R codes for fitting VAR(p) (Vector
Auto Regressive) models and doing the Johansen?s cointegration tests.
TIA
Aditya
2009 Sep 11
1
: How wo read stability VAR plot?
I have made program code for Vector Auto Regressive in terms
of completing my undergraduate program using R. I have an important
question related to my project.
If I have:
data(Canada)
var.2c <- VAR(Canada, p = 2, type = "const")
var.2c.stabil <- stability(var.2c, type = "OLS-CUSUM")
I want to get the value of plot(var.2c.stabil). Can you help
2012 Nov 27
2
order.max specification problem in the ar.ols function
Hello
I am facing a curious problem.I have a time series data with which i want to
fit auto-regressive model of order p, where p runs from 1:9.I am using a
for loop which will fit an AR(p) model for each value of p using the
*ar.ols* function.
I am using the following code
for ( p in 1:9){
a=ar.ols (x=data.ts, order.max=p, demean=T, intercept=T)
}
Specifying the *order.max* to be p, it gives me a
2010 May 12
2
Reading R code help--Beginner
Hi, I am brand new to R and not familiar with the language, though I
have been reading the manuals and making some slow going progress. I am
working with some source code from a Global Vector Auto -Regressive
program written by Ranier Puhr from the R-forge group. I need help
interpreting the processes of the following code.
I am going to
post in parts since it's pretty long:
GVAR
2013 May 24
0
Question about Rpart function
Hello,
When considering linear function where dependent variable is a function of
lags of dependent variables ( co-variates are kind of auto
regressive).Question is .....Can i take entire data set for rpart . Then
split data into training and testing and validate the model for testing
data.In testing data previously predicted value will be the lag of
dependent variable for next prediction.
2004 Sep 21
0
DSE: covariance of white noise
Hi R-Community,
I estimated a VARMA model with bft in dse1 without input: A(L)yt = B(L)et
I got the auto-regressive polynomial array A and the moving-average
polynomial array B, but how can I access the covariances of the white noise
et (disturbance vector), e.g. for simulation?
Much thanks in advance,
Hagen Schmoeller
--
Dipl.-Ing. Hagen K. Schm??ller
Leiter Forschungsgruppe Stromerzeugung
2006 Aug 08
0
gamm question
Hello,
I have two gamm question (I am using gamm in mgcv).
1. In have, say 5 time series. Monthly data, 20 year. The 5 time series are from 5 stations. The data are in vectors, so I have fitted something along the lines of:
tmp<-gamm(Y ~ s(Year,by=station1)+s(Year,by=station2)+
s(Year,by=station3)+s(Year,by=station4)+
2017 Oct 10
0
SILK-implementation some questions
Dear all:
I want to formulate couple of questions about SILK codec:
1.
I've seen the documentation to the SILK codec that is part of the OPUS
exactly the paper with title "The opus codec voice coding with opus, and
the "RFC 6716 specification of opus" . Well, I detected that in both is
defined a High-Pass filter as part of SILK; however in the paper you put
the following