search for: rsitesearched

Displaying 20 results from an estimated 206 matches for "rsitesearched".

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2006 Jul 12
2
AICc vs AIC for model selection
Hi, I am using 'best.arima' function from forecast package to obtain point forecast for a time series data set. The documentation says it utilizes AIC value to select best ARIMA model. But in my case the sample size very small - 26 observations (demand data). Is it the right to use AIC value for model selection in this case. Should I use AICc instead of AIC. If so how can I modify
2011 Sep 30
1
Implementing Silverman's Negative Reflection
Hi! I'm trying to implement in R in an easy way the negative reflection method described in Silverman (1986) on p.31, ie I have a non-negative dataset and would like to estimate the density by applying a reflection method where the reflected points have weight -1. I thought there should be a way to evaluate the wanted kernel at the required points, in other words to calculate formula (2.16):
2005 Apr 12
1
adding R site search to Rgui
From: Gabor Grothendieck > On Apr 11, 2005 11:28 AM, Martin Maechler <maechler at stat.math.ethz.ch> wrote: > > > > If you use R 2.1.0 beta (which you should consider seriously as > > a good netizen ;-), this is as simple as > > > > > RSiteSearch("String manipulation---mixed case") > > A search query has been submitted to
2012 Mar 22
2
trouble for parsing HTML files
Hi all, Using the XML package, I'm not able to parse some html webpages. Here is my code and the error message: library("XML") url <- "http://www.huffingtonpost.com/social/GraniteSkyline?action=fans" doc <- htmlParse(url) Error: Namespace prefix ??? of attribute (null) is not defined I've searched a lot on the Internet, but it's really
2008 May 01
1
Optimal knot locations for splines
Suppose I have two variables, x and y. For a fixed number of knots, I want to create a spline transformation of x such that a loss function is minimized. Presumably, this loss function would be least squares, i.e. sum (f(x)-y)^2. The spline transformations would be linear, quadratic or cubic. I know I can solve this problem using some optimization function in R, but I was wondering if anyone
2006 Aug 09
1
NLS and IV
Hello All, I'm looking to test a variable in a logit model (glm(..., binomial(link="logit"))) for exogeneity (endogeneity). At this point I am planning to try implementing Jeffery Grogger's "A Simple Test for Exogeneity in Probit, Logit, and Poisson Regression Models", Economic Letters, 1990. To do this, I need to be able to do an instrumental variables NLS
2006 Oct 16
1
The old question: R vs MATLAB vs Mathematica vs ...
Hi, This question seems to be old, however I am asking it from a different point of view. R introduces itself as a 'statistical' language and environment. There are many discussions about comparing R to MATLAB or mathematica (or other similar software). It seems to me that these other software have a broader range of applications. For example, in Mathematica one can solve a partial
2009 Apr 03
1
Curve fitting,FDA for biological data
Dear all, Another newbie just got attracted to this mailing list. I am a biologist currently working my way through R, had sort play around with python earlier this year. I have some data exhibiting periodicity ** my data consists of peaks and valleys, with peaks arising due to the presence of a repetitive structural unit,** with x being a reference grid (position along a chromosome) and y
2009 May 20
10
How to google for R stuff?
Hi! I'm new to R programming, though I've been programming in other languages for years. One thing I find most frustrating about R is how difficult it is to use Google (or any other search tool) to look for answers to my R-related questions. With languages with even slightly more distinctive names like Perl, Java, Python, Matlab, OCaml, etc., usually including the name of the language
2011 Dec 28
2
Census ARIMA x-12 seasonal adjustment in R?
Hello, I am new to usin R - which is a great tool - and would like to know if R has a seasonal adjustment program for time series and/if it incorporates the Census Bureau's ARIMA x-12 seasonal adjustment program in any way? Thanks so much! Tony [[alternative HTML version deleted]]
2018 Jan 19
0
how to search r-help?
Also https://www.r-project.org/posting-guide.html indicates that RSiteSearch() within R searches R-help but in my install (3.4.3) RSiteSearch() only searches? "help pages, vignettes or taskviews" On 19/01/18 10:47, Mark Dwyer wrote: > > I am new to this listand am unable to get the search tools listed on >
2009 Mar 31
2
How to generate natural cubic spline in R?
Suppose I have two var x and y,now I want to fits a natural cubic spline in x to y,at the same time create new var containing the smoothed values of y. How can I get it?
2006 Nov 07
1
multivariate splines
Hi, I am looking for an R package that would calculate multivarite (mostly 2d and 3d, tensor) cubic interpolating splines, so that I could evaluate these splines (and their derivatives) at many points (unkown at the time of calculating the spline polynomials) repeatedly. To make things concrete, I have an array V with dim(V) = k and gridpoint vectors grid=list(...), length(grid[[i]])==k[i],
2006 Sep 18
1
Simulation of a Dirichlet Process.
I'm just getting started with R, having a lot of original work on modeling and exploring the simulation by MCMC. I want to simulate the prior and the posterior distribution of Dirichlet Process by MCMC. Is there anyone in NYC that might be a good tutor for me? -- Dr. P. NGOM, Facult? des Sciences et Techniques D?partement de Math?matiques et Informatique Universit? Cheikh Anta Diop Dakar -
2005 Aug 24
1
Panel regression in R
I am currently trying to replicate the results I got from RATS for a panel regression. The codes in RATS looks like this: * Final equation for Office Cap Rate Spread * Regression, Panel Data preg(effects=time, method=random) CapRate # CapRate{1} RentCycle{1} VacancyChangeYTY InflationYTY RealGDPyty Just wonder what R package also allow me to have the options like (effects=time, method=random).
2006 Aug 25
5
Quickie : unload library
Dear list, I know it must be obvious and I did my homework. (In fact I've RSiteSearched with keyword "remove AND library" but got timed out.(why?)....) How do I unload a library? I don't mean getting ride of it permanently but just to unload it for the time being. A related problem : I have some libraries loaded at startup in .First() which I have in .Rprofile. Now, I...
2009 Dec 13
1
debug an error that incapacitates R?
Dear all How should I attempt debugging this error? > sosInit() Error: invalid connection When this happens R refuses to run anything: > 2+2 Error: invalid connection > sessionInfo () Error in stdout() : invalid connection Debugging it seems impossible. > options(error=recover) > sosInit() Error: invalid connection Error during wrapup: invalid connection The error also
2010 Jun 22
2
Verify the linear regression model used in R ( fundamental theory)
Hi, folks, As I understand, Least-squares Estimate (second-moment assumption) and the Method of Maximum Likelihood (full distribtuion assumption) are used for linear regression. I do >?lm, but the help file does not tell me the model employed in R. But in the book 'Introductory Statistics with R', it indicates R estimate the parameters using the method of Least-squares. However it
2011 Nov 09
4
raking weighting
Hi everyone, Does anyone know if there is a package to compute raking weights using R? What I need is to create a variable with weights base in some demographic variables (e.g. sexo, age group, area) using the raking procedure. Thank you in advance! -- Sebasti?n Daza
2008 Jan 10
1
load tcltk
Hi All! Can someone help me with the following problem? Lade n?tiges Paket: tcltk Loading Tcl/Tk interface ... Error in dyn.load(file, ...) : kann shared library '/Library/Frameworks/R.framework/Versions/2.6/ Resources/library/tcltk/libs/ppc/tcltk.so' nicht laden: