Displaying 20 results from an estimated 3000 matches similar to: "R and Hierarchical Forecasting"
2006 Jul 19
2
voronoi tessellations
Okay, been working with tripack, seems the most mature package for this. Got it to work well with their test data set - data(tritest). When i tried random numbers to explore further, i am getting some results that don't reconcile.
example run this:
library(tripack)
y <- runif(100)
x <- runif(100)
vm <- voronoi.mosaic(x,y)
plot(vm)
par(new=T)
plot(x,y,col='blue')
when
2006 Jun 27
1
compositional time series
Dear R users,
i am wondering if anyone has some hints for this problem (i have not found a clear answer after searching the R-mailing list archive, 'help.search' in R, and R-Wiki, and the like...):
let's assume that i have 4 periods compositional time series data:
t=1, A=0.1; B=0.5; C=0.4
t=2, A=0.2; B=0.4; C=0.4
t=3, A=0.5; B=0.3; C=0.2
t=4, A=0.4; B=0.3;
2008 Sep 14
5
string functions
Hello, trying to locate all the string commands in the base version of
R, can't seem to find an area that describes them. I am in need to do
some serious parsing of text data to create my dataset. Is there a
summary link to all the character operators? string manipulations that
would help in parsing text.
2004 May 02
2
r dev site is down
the R developer site has been down for some time, what gives?
http://developer.r-project.org/
2008 Apr 21
3
optFederov/AlgDesign - help avail?
Hello, we are needing to generate optimal (Fractional) designs for
discrete choice applications, where we will be using logistic regression
or multinomial logit as the modeling technique.
It looks like optFederov, in the AlgDesign package may work, but not
sure if this algorithm works when the variable of interest is binary or
nominal?
Anyone who are experts in this area, anyone interested
2006 May 19
6
bayesian belief networks to determine causality
Hello, does R estimate belief networks to estimate chains of causality.
Anyone point me to the right direction, or the most developed library?
looking at DEAL>
2009 Sep 26
3
evaluate a set of symbols within an IF statement
Hello, writing some R code to cleanse a data set, if the following set
of symbols are identified then perform some actions. trying to write
the minimum code to do this.
tname = "VIX"
checkticker = c("VIX", "TYX", "TNX", "IRX")
if (tname == checkticker) {
//perform some operations
}
result i get is
> tname == checkticker
2009 Nov 09
4
prcomp - principal components in R
Hello, not understanding the output of prcomp, I reduce the number of
components and the output continues to show cumulative 100% of the
variance explained, which can't be the case dropping from 8 components
to 3.
How do i get the output in terms of the cumulative % of the total
variance, so when i go from total solution of 8 (8 variables in the data
set), to a reduced number of
2010 Mar 11
4
Forecast
sample report data that i want to forecast
quarter quarter_index Revenue
2007 Q1 1 $3,856,799
2007 Q2 2 $4,243,328
2007 Q3 3 $4,930,369
2007 Q4 4 $5,443,579
2008 Q1 5 $5,164,830
2008 Q2 6 $5,104,413
2008 Q3 7
2010 Mar 17
1
Reg GARCH+ARIMA
Hi,
Although my doubt is pretty,as i m not from stats background i am not sure
how to proceed on this.
Currently i am doing a forecasting.I used ARIMA to forecast and time series
was volatile i used garchFit for residuals.
How to use the output of Garch to correct the forecasted values from ARIMA.
Here is my code:
###delta is the data
fit<-arima(delta,order=c(2,,0,1))
fit.res <-
2009 Mar 29
2
Mature SOAP Interface for R
Hello, we are writing rich internet user interfaces and like to call R
for some of the computational needs on the data, as well as some
creation of image files. Our objects communicate via the SOAP
interface. We have been researching the various packages to expose R as
a SOAP service.
No current CRAN SOAP packages however.
Found 3 to date:
RSOAP (http://sourceforge.net/projects/rsoap/)
2004 Apr 20
1
multi-user engine
hello, i just got introduced to R - WOW its beautiful..
I am presently a SAS user and wanted to configure R to work in a multi-user
enteprise environment. Client - Server. Where we have a strong LINUX
server supporting about 10 statisticians with R. Anyone have any backround
or information they can share to help me get jump-started on setting up R in
this environment? Does each user have
2009 Nov 23
2
dynlm predict with newdata?
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2007 Dec 04
1
Best forecasting methods with Time Series ?
Hello,
In order to do a future forecast based on my past Time Series data sets
(salespricesproduct1, salespricesproduct2, etc..), I used arima() functions
with different parameter combinations which give the smallest AIC. I also
used auto.arima() which finds the parameters with the smallest AICs. But
unfortuanetly I could not get satisfactory forecast() results, even
sometimes catastrophic
2012 Feb 29
2
How to extract numerical values from time series forecast
hi all. i'm busy with some time series data, starting from an earlier period
until the current day.
i have created a time series forecast taking into account the entire data
from the earlier date up until 2007, using the "forecast" package for R. i
am comparing this forecasted data to the actual/ observed data (which starts
from the earlier date up until the current day).
my
2012 Jan 18
1
forecasting a time series
Couldn't find this in the archives. I'm fitting a series of historical
weather-related data, but would like to use the latest values to forecast.
So let's say that I'm using 1970-2000 to fit a model (using fourier terms
and arima/auto.arima), but now would like to use the last X values to
predict tomorrow's weather. I'm at a loss. All the functions I've come
across
2009 Jan 21
1
forecasting issue
Hello everybody!
I have a problem when I try to perform a forecast of an ARIMA model
produced by an auto.arima function. Here is what I'm doing:
c<-auto.arima(fil[[1]],start.p=0,start.q=0,start.P=0,start.Q=0,stepwise=TRUE,stationary=FALSE,trace=TRUE)
# fil[[1]] is time series of monthly data
ARIMA(0,0,0)(0,1,0)[12] with drift : 1725.272
ARIMA(0,0,0)(0,1,0)[12] with drift
2011 Jun 29
1
lmer() computational performance
Hello, running a mixed model in the package LME4, lmer()
Panel data, have about 322 time periods and 50 states, total data set is
approx 15K records and about 20 explanatory variables. Not a very
large data set.
We run random intercepts as well as random coefficients for about 10 of
the variables, the rest come in as fixed effects. We are running into
a wall of time to execute these models.
2017 Jul 12
2
Question on Simultaneous Equations & Forecasting
Hello,
I have estimated a simultaneous equation model (similar to Klein's model) in R using the system.fit package.
I have an identity equation, along with three other equations. Do you know how to explicitly identify the identity equation in R?
I am also trying to forecast the dependent variables in the simultaneous equation model, while incorporating the identity equation in the
2005 Dec 14
1
Kalman Filter Forecast using 'SSPIR'
Dear R Users,
I am new to state-space modeling. I am using SSPIR
package for Kalman Filter. I have a data set containing one dependent
variable and 7 independent variables with 250 data points. I want to use
Kalman Filter for forecast the future values of the dependent variable
using a multiple regression framework. I have used ssm function to
produce the state space (SS)