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2008 Oct 23
1
Calculating confidence limits for the difference betweenmeans
Sender: r-help-bounces at r-project.org On-Behalf-Of: kingsfordjones at gmail.com Subject: Re: [R] Calculating confidence limits for the difference between means Message-Id: <2ad0cc110810231137n66760e43i61bdd0c89622d040 at mail.gmail.com> Recipient: ngottlieb at marinercapital.com -------------------------------------------------------- This information i...
2008 Apr 29
2
function to generate weights for lm?
Hi, I would like to use a weighted lm model to reduce heteroscendasticity. I am wondering if the only way to generate the weights in R is through the laborious process of trial and error by hand. Does anyone know if R has a function that would automatically generate the weights need for lm? Thanks, -- Tom [[alternative HTML version deleted]]
2008 May 09
1
Which gls models to use?
Hi, I need to correct for ar(1) behavior of my residuals of my model. I noticed that there are multiple gls models in R. I am wondering if anyone has experience in choosing between gls models. For example, how should one decide whether to use lm.gls in MASS, or gls in nlme for correcting ar(1)? Does anyone have a preference? Any advice is appreciated! Thanks, -- Tom [[alternative HTML
2008 Oct 23
15
VEC Operator in R
Can anyone please tell whether there is any R function to act as "VEC" and "VECH" operator on Matrix? Yes of course, I can write a user-defined-function for that or else, I can put dim(mat) <- NULL. However I am looking for some R function. Your help will be highly appreciated. Regards, -- View this message in context:
2009 Jan 02
0
Spatial Data Analysis in R [was: Basic Question about use of R]
resending to provide a more informative subject line.... On Fri, Jan 2, 2009 at 3:21 PM, Kingsford Jones <kingsfordjones at gmail.com> wrote: > Hi David, > > A general answer to your question is: yes, R would be useful for such > analyses - particularly when interfaced with a GIS. For an > introduction to the types of spatial tools available in R see the Task > View for spatial data: > http...
2006 Oct 05
4
glm with nesting
I just had a manuscript returned with the biggest problem being the analysis. Instead of using principal components in a regression I've been asked to analyze a few variables separately. So that's what I'm doing. I pulled a feather from young birds and we quantified certain aspects of the color of those feathers. Since I often have more than one sample from a nest, I thought I
2009 Jul 23
1
setting up LMER for repeated measures and how do I get a p value for my fixed effect, group?
R 2.8.1 Windows XP I am trying to analyze repeated measures data (the data are listed at the end of this Email message) and I need help to make sure that I have properly specified my model, and would like to know why lmer does not return a p value for Group, my fixed effect. My subjects are divided into two groups (variable GROUP), individual subjects are indicated by the variable SS, Value is
2009 Jan 11
2
R, clinical trials and the FDA
I hope that Marc doesn't mind, but I felt that part of his recent post was important enough to deserve it's own subject line rather then being lost in a 60-msg-long thread... On Sun, Jan 11, 2009 at 10:08 AM, Marc Schwartz <marc_schwartz at comcast.net> wrote: ... I strongly believe that the comments regarding R and the FDA are overly negative and pessimistic. The hurdles to
2009 Mar 14
1
multiple hypothesis testing
...e. > > > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem that you are trying to solve? > > > > ------------------------------ > > Message: 8 > Date: Fri, 13 Mar 2009 06:28:16 -0600 > From: Kingsford Jones <kingsfordjones@gmail.com> > Subject: Re: [R] Selecting / creating unique colours for behavioural / > transitional data > To: Ross Culloch <ross.culloch@dur.ac.uk> > Cc: r-help@r-project.org > Message-ID: > <2ad0cc110903130528oa57b8c6w17ddf66b5a280ecd@mail.gmail.com&gt...
2009 Jan 15
2
Interface to open source Reporting tools
...23rd Street, 8th floor > New York, NY 10010 > tel: (212) 845-4495 (Tu, Th) > tel: (732) 512-0171 (M, W, F) > fax: (917) 438-0894 > > > > ------------------------------ > > Message: 32 > Date: Sat, 10 Jan 2009 12:50:36 -0700 > From: "Kingsford Jones" <kingsfordjones@gmail.com> > Subject: Re: [R] R in the NY Times > To: "Tony Breyal" <tony.breyal@googlemail.com> > Cc: r-help@r-project.org > Message-ID: > <2ad0cc110901101150t191458f7j9d16eb076f42e30d@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-...
2010 Aug 24
0
mlm for within subject design
...16 dataframes written to 16 worksheets in one workbook ... no problem, ... worked the first time (at least it did so once I realized I needed to follow the directions in the help page exactly as they were written :-). David Winsemius, MD West Hartford, CT --Forwarded Message Attachment-- From: kingsfordjones at gmail.com CC: r-help at r-project.org To: liulei at virginia.edu Date: Mon, 23 Aug 2010 15:25:48 -0600 Subject: Re: [R] trajectory plot (growth curve) and some more options... dat <- structure(list(ID = structure(c(1L, 1L, 1L, 2L, 2L, 2L, 2L), .Label = c("1", "2"),...
2009 Sep 11
3
For sending my R package as part of R-project
...29 at york.ac.uk ------------------------------ Message: 42 Date: Thu, 10 Sep 2009 18:48:31 +0100 From: Corrado <ct529 at york.ac.uk> Subject: [R] AIC and goodness of prediction - was: Re: goodness of "prediction" using a model (lm, glm, gam, brt, To: Kingsford Jones <kingsfordjones at gmail.com> Cc: r-help at r-project.org Message-ID: <200909101848.31836.ct529 at york.ac.uk> Content-Type: Text/Plain; charset="iso-8859-1" Dear Kingsford, I apologise for breaking the thread, but I thought there were some more people who would be interested. What you pro...
2009 Oct 28
1
Easy method to set user-mode virtual memory space in Windows Vista and 7
I thought I'd share this with the list since it appears to provide a quick fix to some memory problems, and I haven't see it discussed in relation to R. To reallocate virtual memory from kernel-mode to user-mode in 32-bit Vista or Windows 7 one can use the increaseuserva boot option value. See http://msdn.microsoft.com/en-us/library/aa906211.aspx On my 4GB Vista machine, R is now able to