Displaying 20 results from an estimated 7000 matches similar to: "time series regression"
2006 Jul 01
1
polynomial expansion in R
Hi:
I have two vectors of data, x and y and I want to get the "polynomial" expansion of (x+y)^p with any integer power p in R. Suppose p=2, then I want a matrix of five vectors, namely, x y x^2 y^2 x*y. The coefficient of the polynomial is not needed. I can write it manully if p is small. But I want it in the case of p=10 or even bigger, is there any function in R can do that
2006 Nov 22
1
question about the "solve" function in library "Matrix"
Hi:
I have some problems when I use the function "solve" function in a loop. In the following code, I have a diagonal martix "ttt" whose elements change in every iteration in a loop. I defined a "dpoMatrix"class before the loop so I do not need to define this class every time in the loop. The reason is to save some computing time. The code is below. The inverse
2007 Feb 05
2
"lme" in R and Splus-7
Hi:
I used the function "lme" in R and Splus-7. With the same dataset and same argument for the function, I got quite different estimation results from these two software. Anyone has this experience before?
zhong
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2005 Mar 09
3
from long/lat to UTM
Hi:
Is there any function in R which can convert the
long/lat to UTM(Universal Transverse Mercator)?
There are quite a few converters on Internet.
However, the interface is designed as input->output
which I can not convert lots of locations at the same
time.
Another question is whether there is a function in R
which can tell the time zone from the location's
lat/long?
Thank you!
2004 Oct 11
2
memory in R
Hi:
I am doing a MCMC algorithm which is well known to
consume much computer memory. And I have a problem
everytime I run my R program. It stopped at certain
iteration and says "can not allocate a vector of 19
kb".
It seems that the computer's memory has been
exhausted. However, it is said that after each
iteration the objects (such as a huge matrix) can be
set to NULL. And the
2008 Jun 08
3
how to important a date file into R
Hi:
I have a data file in the following format. The first three digits stand for the ID of a respondent such as 402, 403. Different respondents may have the same ID. Followed the ID are 298 single digit number ranging from 1 to 5. My question is how to read this data file into R. I tried "scan" and "read" but they do not work because the numbers in the file are not
2010 Apr 17
2
interpreting acf plot
Hello,
I am attending a course in Computational Statistics at ETH and in one of the assignments I am asked to prove that a time series is not autocorrelated using the R function "acf".
I tried out the acf function with the given data, according to what I found here: http://landshape.org/enm/options-for-acf-in-r/ this test data does not look IID but rather shows some trends so how can I
2006 Nov 06
1
question about function "gls" in library "nlme"
Hi:
The gls function I used in my code is the following
fm<-gls(y~x,correlation=corARMA(p=2) )
My question is how to extact the AR(2) parameters from "fm".
The object "fm" is the following. How can I extract the correlation parameters
Phi1 and Phi2 from "fm"? These two parametrs is not in the "coef" componenet of "fm".
Thanks a
2005 Aug 11
1
include C functions from nmath in my own C functions
Hi:
I followed the README in src/nmath/standalone/
to make the use the command "make shared" to make the
libRmath.so file. I also add the directories containg
libRmath.so to LD_LIBRARY_PATH by using command
"export
D_LIBRARY_PATH=$LD_LIBRARY_PATH:$/home/zhliu/Backup/R-2.0.1/src/nmath/standalon
e
"
However, when I try to run the following codes by the
command
2007 Dec 04
1
Metropolis-Hastings within Gibbs coding error
Dear list,
After running for a while, it crashes and gives the following error message: can anybody suggest how to deal with this?
Error in if (ratio0[i] < log(runif(1))) { :
missing value where TRUE/FALSE needed
################### original program ########
p2 <- function (Nsim=1000){
x<- c(0.301,0,-0.301,-0.602,-0.903,-1.208, -1.309,-1.807,-2.108,-2.71) # logdose
More clear statement about the question of how to generate regression matrix with correlation matrix
2003 Jul 12
1
More clear statement about the question of how to generate regression matrix with correlation matrix
Dear R community:
I am trying to do a simulation study mentioned by Fu (1998), Journal of Computational and Graphical Statistics, Volume7, Number 3, Page 397-416. In order to give a clear statement of quesion I copy the following paragraph from the article: We compare the bridge model with the OLS, the lasso and the ridge in a simulation of a linear regression model of 30 observations and 10
2004 Jul 19
1
(no subject)
hello R experts,
my question is regarding arma modelling and specification.
in another older, statistics package , after determining stationarity, i would try to work out the number of ar and ma lags using an lm test.
to do this i would
1. regress my dependant variable on an intercept term then
2. use LM test for serial correlation, and finally
3. use the p value of the ols residuals to get
2008 May 22
1
How to account for autoregressive terms?
Hi,
how to estimate a the following model in R:
y(t)=beta0+beta1*x1(t)+beta2*x2(t)+...+beta5*x5(t)+beta6*y(t-1)+beta7*y(t-2)+beta8*y(t-3)
1) using "lm" :
dates <- as.Date(data.df[,1])
selection<-which(dates>=as.Date("1986-1-1") & dates<=as.Date("2007-12-31"))
dep <- ts(data.df[selection,c("dep")])
indep.ret1
2008 Mar 19
1
betabinomial model
Hi,
can anyone help me fit betabinomial model to the following dataset where
each iD is a cluster in itself , if i use package aod 's betabinom model it
gives an estimate of zero to phi(the correlation coeficient ) and if i fix
it to the anova type estimate obtained from icc( in package aod) then it
says system is exactly singular. And when i try to fit my loglikelihood by
2005 Dec 01
2
Minimizing a Function with three Parameters
Hi,
I'm trying to get maximum likelihood estimates of \alpha, \beta_0 and
\beta_1, this can be achieved by solving the following three equations:
n / \alpha + \sum\limits_{i=1}^{n} ln(\psihat(i)) -
\sum\limits_{i=1}^{n} ( ln(x_i + \psihat(i)) ) = 0
\alpha \sum\limits_{i=1}^{n} 1/(psihat(i)) - (\alpha+1)
\sum\limits_{i=1}^{n} ( 1 / (x_i + \psihat(i)) ) = 0
\alpha \sum\limits_{i=1}^{n} (
2005 Feb 10
2
correcting for autocorrelation in models with panel data?
Hi
I have some panel data for the 50 US states over about 25 years, and I
would like to test a simple model via OLS, using this data. I know how
to run OLS in R, and I think I can see how to create Panel Corrected
Standard Errors using
http://jackman.stanford.edu/classes/350C/pcse.r
What I can't figure out is how to correct for autocorrelation over
time. I have found a lot of R stuff on
2007 Mar 13
1
AR(1) and gls
Hi there,
I am using gls from the nlme library to fit an AR(1) regression model.
I am wondering if (and how) I can separate the auto-correlated and random
components of the residuals? Id like to be able to plot the fitted values +
the autocorrelated error (i.e. phi * resid(t-1)), to compare with the
observed values.
I am also wondering how I might go about calculating confidence (or
2003 Nov 07
2
Bug in cor.test - Spearman
Greetings.
There seems to be a problem with the P-value computation in the
cor.test with method="spearman". In R1.8.0 (MS Windows) I
seem to be getting intermittently nonsense P-values, but the rho's
are OK. I can get this reproducibly with the toy example attached
where the first use is OK and subsequent calls with the same data
give nonsense. (I have also seen the problem
2012 Aug 07
6
Decimal number
HI
>i have a little problem please help me to solve it
>this is the code in R:
>> beta0
[1] 64.90614
> beta1
[1] 17.7025
> beta
[1] 17 64
>her beta<- c(beta0, beta1)
thank you in advance
hafida
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2008 Aug 22
2
WinBUGS with R
Dear Users,
I am new to both of things, so do not blame me too much...
I am busy with semiparametric regression and use WinBUGS to sample
posteriors.
The code to call Winbugs is as follows:
data <- list("y","X","n","m") #My variables
inits.beta <- rep(0,K)
inits.beta0 <- 0
inits <-