Displaying 20 results from an estimated 400 matches similar to: "How do I output all the R-squares of an SUR? summary(fitSUR$eq[[1:4]])$r.squared does not work"
2011 Jun 21
1
Setting up list of many equations for systemfit
Dear List Members,I am trying to set up a large system of equations and I am trying to find a simple way to set up the list command under the package system fit. Here is the example from system fit and what I am trying to do:
EQ1 <- Y1 ~ X1 + X2 + X4EQ2 <- Y2 ~ X2 + X3EQ3 <- Y3 ~ X2 + X3 + X4EQ4 <- Y4 ~ X1 + X3 + X4eqSystem <-list(form1 = EQ1, form2 = EQ2, form3 = EQ3, form4 = EQ4)
2011 Jun 23
0
Loops, Paste, Apply? What is the best way to set up a list of many equations?
Is there a way to apply paste to?list(form1 = EQ1, form2 = EQ2, form3 = EQ3, form4 = EQ4)?such that I don't have to write form1=EQ1 for all my models?(I might have a list of 20 or more)? I also need the EQs to read the formulas associated with them.
For example, below, I was able to automate the name assignment but I could not figure out how to?to set up the list using?paste or other
2004 Nov 29
3
systemfit - SUR
Hello to everyone,
I have 2 problems and would be very pleased if anyone can help me:
1) When I use the package "systemfit" for SUR regressions, I get two
different variance-covariance matrices when I firstly do the SUR
regression ("The covariance matrix of the residuals used for
estimation") and secondly do the OLS regressions. In the manual for
"systemfit" on page
2012 Oct 17
1
extracting and restricting coefficients
HiĀ
I want to fit two equations simultaneously
EQ1<-Y1~X1+X2
EQ2<-Y2~X1+X2
eqsystem<-list(Y1HAT=EQ1,Y2HAT=EQ2)
fitols<-systemfit(eqsystem,
method="OLS", data=BB)
How do I get coefficients for the first equation? R code
How do I restrict coefficient of X2 in the first equation (say , restrict it to less thanĀ zero). R code
Your help is
appreciated.
Dereje
[[alternative
2009 Apr 13
2
joint estimation of two poisson equations
Dear list members,
Is there a package somewhere for jointly estimating two poisson processes?
I think the closest I've come is using the "SUR" option in the Zelig
package (see below), but when I try the "poisson" option instead of
the "SUR" optioin I get an error (error given below, and indeed,
reading the documentation of the Zelig package, I get the impression
2009 Aug 18
3
R formula
Hi
I was trying to estimate simultaneous equation system in R using systemfit.
I used the following commands
>library(systemfit)
> data(Kmenta)
> attach(Kmenta)
>eqDemand<-consump~price+income
> eqSupply<-consump~price+farmprice+trend
> fitsur<-systemfit("SUR",list(demand=eqDemand, supply=eqSupply))
and got the following error messege
Error in
2011 Jun 24
4
What does class "call" mean? How do I make class "formula" into a "call"?
I have a list called "tabs" that I would like to have the same structure as my list "eqSystem." The two look like they have the same format but they are different because when I look at their attributes, class(eqSystem[[1]]) is "call" but class(tabs[[1]]) is "formula". I want to have class(tabs[[1]]) as a call too. So what does "call" mean? And how
2010 Sep 03
1
How to use lm() output for systemfit() 'Seemingly unrelated regression'
I am having problem using output of lm() function for further analysing using
systemfit package.
Basicaly, the problem s following - I generate several formulas using lm()
> fo1 <- lm(r98[,2] ~ f98[,1] + f98[,2] + ... + f98[,43])
> fo2 <- lm(r98[,1] ~ f98[,1] + f98[,2] + ... + f98[,43])
and than I want to estimate a general model using package systemfit.
> fitsur <-
2002 Aug 13
0
Non linear SUR estimation
TO: r-help at lists.R-project.org
r-help at stat.math.ethz.ch
Hello to everyone,
I found some problems using R in the estimation of systems of nonlinear
equations
like SURE (Seemingly Unrelated Regression Equations) with mutual
parameters as the following system example:
EQ1 PQ1=P1*G1+B1*(Y-P1*G1-P2*G2-P3*G3)
EQ2 PQ2=P2*G2+B2*(Y-P1*G1-P2*G2-P3*G3)
where G1,G2,G3,B1,B2 are the
2010 Aug 25
1
SEM : Warning : Could not compute QR decomposition of Hessian
Hi useRs,
I'm trying for the first time to use a sem. The model finally runs,
but gives a warning saying :
"In sem.default(ram = ram, S = S, N = N, param.names = pars, var.names
= vars, : Could not compute QR decomposition of Hessian.
Optimization probably did not converge. "
I found in R-help some posts on this warning, but my attemps to modify
the code didn't change
2007 Apr 13
0
Problem with predict in systemfit
A friend of mine sent me below so I am posting below. If it is not
enough information, please just
let me know and I will tell him. Thanks.
-----Original Message-----
Sent: Friday, April 13, 2007 3:58 PM
To: Leeds, Mark (IED)
Subject: R question
I am using the "predict" function after I have done a simultaneous
estimation of a system using "systemfit". fitsur is the output
2011 Nov 15
1
Estimating model parameters for system of equations
Hi all,
I'm trying to estimate model parameters in R for a pretty simple system of
equations, but I'm having trouble. Here is the system of equations (all
derivatives):
eqAlgae <- (u_Amax * C_A) * (1 - (Q_Amin / Q_A))
eqQuota <- (p_max * R_V) / (K_p + R_V) - ((Q_A-Q_Amin)*u_Amax)
eqResource <- -C_A * (p_max * R_V) / (K_p + R_V)
eqSystem <- list(C_A = eqAlgae, Q_A = eqQuota,
2017 Jun 11
1
Memory leak in nleqslv()
Hello all,
I am relatively new to R, but enjoying it very much. I am hoping that
someone on this list can help me with an issue I am having.
I am having issues with iterations over nleqslv, in that the solver
does not appear to clean up memory used in previous iterations. I
believe I've isolated the/my issue in a small sample of code:
library(nleqslv)
cons_ext_test <- function(x){
2007 Mar 28
0
nlsystemfit: Errors with reproducing the manual example
Hi everybody, I'm a newbye with lots of problems :). I'm trying to use
nlsystemfit, but I recieve two error messages whose origin that I don't
understand.
1) When I try to reproduce the example reported in the systemfit package
manual, that is
library( systemfit )
data( ppine )
hg.formula <- hg ~ exp( h0 + h1*log(tht) + h2*tht^2 + h3*elev + h4*cr)
dg.formula <- dg ~ exp( d0
2011 Oct 02
0
deSolve - Function daspk on DAE system - Error
I'm getting this error on the attached code and breaking my head but can't
figure it out. Any help is much appreciated. Thanks, Vince
CODE:
library(deSolve)
Res_DAE=function(t, y, dy, pars) {
with(as.list(c(y, dy, pars)), {
res1 = -dS -dES-k2*ES
res2 = -dP + k2*ES
eq1 = Eo-E -ES
eq2 = So-S -ES -P
return(list(c(res1, res2, eq1, eq2)))
})
}
pars <- c(Eo=0.02,
2011 Oct 03
0
deSolve - Function daspk on DAE system - Error (Vince)
Vince,
When that happens, one possible reason is that your DAE is of index > 1,
which cannot be solved by daspk.
The solver radau, also from deSolve can handle DAEs up to index 3, but
you need to rewrite the problem in the form M*y' = f(x,y), where M is a
mass matrix.
If you do that for your problem, and solve it with radau, then radau
complains that the "matrix is repeatedly
2007 May 23
0
Changing sequential regression code to call systemfit
I use code ( actually its code from vars package and its directly below
) to do a sequence of lm calls and the data I use from the matrix
depends on restrictions.
for(i in 1:K){
datares <- datasub[, which(x$restrictions[i, ] == 1),drop=FALSE]
y <- yendog[, i]
lmres <- lm(y ~ -1 + ., data=datares)
# x$varresult[[i]] <- lmres
# x$resid[, i] <-
1998 Feb 04
0
An old ld-linux.so hole
Section I. Overview
Hello,
About a half year ago there was some rumour on bugtraq concerning a buffer
overflow in Linux dynamic linkers, ld.so and ld-linux.so. You can take a look
at the beginning of the thread at http://www.geek-girl.com/bugtraq/1997_3/0089.html
to refresh old memories; I''ll capitalize anyway.
Briefly, there exists a buffer overrun in ld-linux.so versions 1.7.14,
2002 Jul 31
0
Nonlinear Seemingly Unrelated Regression
Hello to everyone,
I found some problems using R in the estimation of systems of nonlinear
equations
like SURE (Seemingly Unrelated Regression Equations) with mutual
parameters as the following system example:
EQ1 PQ1=P1*G1+B1*(Y-P1*G1-P2*G2-P3*G3)
EQ2 PQ2=P2*G2+B2*(Y-P1*G1-P2*G2-P3*G3)
where G1,G2,G3,B1,B2 are the coefficients to estimate.
command "nls" accept only single
2009 May 25
0
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