similar to: find "CP"

Displaying 20 results from an estimated 20000 matches similar to: "find "CP""

2005 Dec 08
1
mle.stepwise versus step/stepAIC
Hello, I have a question pertaining to the stepwise regression which I am trying to perform. I have a data set in which I have 14 predictor variables accompanying my response variable. I am not sure what the difference is between the function "mle.stepwise" found in the wle package and the functions "step" or "stepAIC"? When would one use
2010 Jan 04
2
MLE optimization
Folks, I'm kind of newbie in R, but with some background in Matlab and VBA programming. Last month I was implementing a Maximum Likelihood Estimation in Matlab, but the algorithms didn't converge. So my academic advisor suggested using R. My problem is: estimate a mean reverting jump diffusion parameters. I've succeeded in deriving the likelihood function (which looks like a gaussian
2007 May 11
1
model seleciton by leave-one-out cross-validation
Hi, all When I am using mle.cv(wle), I find a interesting problem: I can't do leave-one-out cross-validation with mle.cv(wle). I will illustrate the problem as following: > xx=matrix(rnorm(20*3),ncol=3) > bb=c(1,2,0) > yy=xx%*%bb+rnorm(20,0,0.001)+0 > summary(mle.cv(yy~xx,split=nrow(xx)-1,monte.carlo=2*nrow(xx),verbose=T), num.max=1)[[1]] mle.cv: dimension of the split subsample
2005 Aug 26
2
Fitting data to gaussian distributions
Hi! I need to fit a data that shows up as two gaussians partially superimposed to the corresponding gaussian distributions, i.e. data=c(rnorm(100,5,2),rnorm(100,-6,1)) I figured it out how to do it with mle or fitdistr when only one gaussian is necessary, but not with two or more. Is there a function in R to do this? Thank you very much in advance, Luis
2011 Jun 22
1
AIC() vs. mle.aic() vs. step()?
I know this a newbie question, but I've only just started using AIC for model comparison and after a bunch of different keyword searches I've failed to find a page laying out what the differences are between the AIC scores assigned by AIC() and mle.aic() using default settings. I started by using mle.aic() to find the best submodels, but then I wanted to also be able to make comparisons
2003 Apr 22
7
Subject: Eliminate repeated components from a vector X-Mailer: VM 7.00 under 21.4 (patch 6) "Common Lisp" XEmacs Lucid Reply-To: fjmolina at lbl.gov FCC: /home/f/.xemacs/mail/sent Does anyone know how I can eliminate repeated elements from a vector?
2011 Jun 23
1
Ranking submodels by AIC (more general question)
Here's a more general question following up on the specific question I asked earlier: Can anybody recommend an R command other than mle.aic() (from the wle package) that will give back a ranked list of submodels? It seems like a pretty basic piece of functionality, but the closest I've been able to find is stepAIC(), which as far as I can tell only gives back the best submodel, not a
2008 Dec 10
1
Stepwise regression
Hi, I have the response variable 'Y' and four predictors say X1, X2, X3 and X4. Assuming all the assmptions like Y follows normal distribution etc. hold and I want to run linear multiple regression. How do I run the stepwise regression (forward as well as the backward regression). >From other software (i.e. minitab), I know only X1 and X2 are significant so my regression equation
2007 Dec 25
2
T43 wireless ipw2200 centos 4.4
Hi ALL, Short description of my problem: I am not able to make wireless network working on the IBM ThinkPad T43p. System: T43p OS: CentOS 4.4 kernel: 2.6.9-34.EL firmware: ipw2200-firmware-3.0-3.nodist.rf.noarch.rpm What did I do ? - installed firmware from RPM package - removed kernel driver (/sbin/rmmod ipw2200) - installed kernel module (/sbin/modprobe ipw2200) dmesg output:
2014 Aug 18
2
need-restart ?
Hi, today I updated the glibc packages on some CentOS machines. After the Update I checked which services/processes I have to restart "yum -C ps" or "needs-restarting" At the most machines I get no information about necessary restarts, but at two machines a long listing : 1 : /sbin/init 386 : /sbin/udevd-d 659 : /sbin/udevd-d 999 : /usr/sbin/vmtoolsd 1103 : auditd 1128 :
2005 Sep 29
1
Error using a data frame as the "start" parameter in mle()
Dear R-Users, I am trying to use mle() to optimize two (or more) parameters, but I want to specify those parmeters in a data frame rather than having to spell them out separately in the "start" variable of mle(). My call is > mle(negll, start=list(aps=init), fixed=list(measphot=newphot, formod=formod, Nbands=Nbands), method="BFGS") where negll is a function I have
2006 Feb 02
2
how to use mle?
>Y [,1] [,2] [,3] [1,] 0 1 0 [2,] 0 1 0 [3,] 0 0 1 [4,] 1 0 0 [5,] 0 0 1 [6,] 0 0 1 [7,] 1 0 0 [8,] 1 0 0 [9,] 0 0 1 [10,] 1 0 0 >X pri82 pan82 1 0 0 2 0 0 3 1 0 4 1 0 5 0 1 6 0 0 7 1 0 8 1 0 9 0 0 10
2005 Sep 12
1
fit data with gammadistribution
hello my data is data2:2743 4678 21427 6194 10286 1505 12811 2161 6853 2625 14542 694 11491 14924 28640 17097 2136 5308 3477 91301 11488 3860 64114 14334 by calculating shape<-(mean(data2))^2/var(data2) scale<-var(data2)/mean(data2) i get the idea what the parameters of the gammadistribution would be. but if i try using the method mle() i get stock and i don't know, how to
2009 Apr 08
3
MLE for bimodal distribution
Hello everyone, I'm trying to use mle from package stats4 to fit a bi/multi-modal distribution to some data, but I have some problems with it. Here's what I'm doing (for a bimodal distribution): # Build some fake binormally distributed data, the procedure fails also with real data, so the problem isn't here data = c(rnorm(1000, 3, 0.5), rnorm(500, 5, 0.3)) # Just to check
2008 Jun 19
1
try to find the MLE of a function
Hi everyone: I have a density function f(x|theta)=theta*x^(theta-1),where 0<x<1,0<theta<infinite I want to pratice on R to find the MLE of this function,here is my code: x <- (0:10)/10 f<-function(theta) prod(theta*x^(theta-1)) mle(f) and r gave me :Error in eval(expr, envir, enclos) : argument is missing, with no default what mistake I just made?and how to add a
2005 Jul 26
1
SETAR Estimation
Dear R-helpers, I was wondering if anyone has or knows someone who might have an implementation of algorithm for estimating SETAR models including the lag-order. For some reason my code gives me a bit wrong results. I am fighting with it for a week and cannot bring it down. Thanks a million in advance, Sincerely, Evgueni McGill University Department of Economics
2009 May 21
2
good numerical optimization to use in R?
Hi all, Could anybody point me to a good/robust numerical optimization program to use in R? I am doing some MLE fitting. Thanks!
2005 Dec 09
1
Hald
No manpage or other info in the system about the hald or hal. What little I did find on a RH site did not really enlighten me that much. Is there some obscure documentation somewhere about the hald and its assets and attributes? -- Snowman
2004 Dec 16
3
3 questions
Hello R users, I have three questions and I would be grateful if someone could give me an answer to each of these. 1) I have constracted a function that returns an output, which runs in a while( condition ){ run function } loop. I would like to know if there is a way to get the outputs in different windows, every time the function runs, so as to compare easier the results. 2) In my
2006 Mar 10
1
NUT-NG (was: ideas for a new UPS infrastructure)
some notes: - for this kind of discussion, please cc upsdev list (I've added it), - I've fwded the full thread to upsdev, - this subject is part of what I call NUT-NG (next gen.), aka nut 3.0... - I'll study in depth the thread this week end, and complete with my thoughts, - thanks to Stan to have put us all in touch Arnaud 2006/3/10, Stanislav Brabec <sbrabec@suse.cz>: >