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Mean and variance of Poisson distributed data are specified by \rho. How can I estimate \rho for a set of measurements in R? Many thanks! Titus

Thanks for the responses! For the record: the issue is briefly discussed in the book by Pinheiro & Bates, section 4.1.1, page 141. Titus

http://www.rseek.org/ It is particularly useful to search the mailing list archives of r-help with rSeek. No matter what kind of problem you have, somebody has had it before and asked on r-help. Titus

On Mon, Sep 27, 2010 at 7:16 PM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote: > You've tried: > > gregexpr("b+", "abcdaabbc") But this would match the third occurrence of b+ in "abcdaabbcbb". But in this example I'm only...

When loading mclust, it shows a license agreement message. This message shows up in my document when I use Sweave. I did the following: <<echo=FALSE,include=FALSE>>= library(mclust) @ Is this a problem with mclust, Sweave or with me...

On Tue, Jun 09, 2009 at 11:04:03AM -0400, Stavros Macrakis wrote: > This may seem like a minor point, but I think it is worthwhile using > descriptive names for functions. Makes sense. I thought I've seen this use...

Ok, we decided to have a shot at modifying gregexpr. Let's see how it works out. If anybody is interested in discussing this please contact me. R-help doesn't seem like the right place for further discussion. Is...

On Mon, Sep 27, 2010 at 7:29 PM, Gabor Grothendieck <ggrothendieck at gmail.com> wrote: > Try this zero width negative look behind expression: > >> gregexpr("(?!a+)(b+)", "abcdaabbc", perl = TRUE) > [[1]] > [1] 2 7 > attr(,"match.length") > [1] 1 2...

Ok, I studied the source code of melt.data.frame. With na.rm=T melt operates normally except that it deletes rows from the molten data.frame that have NAs in the value column. NAs in the id.vars are...

On Mon, Feb 16, 2009 at 11:08:24AM -0800, Christian Langkamp wrote: > I could of course log the whole data > set, but then explaining that transformation within a presentation is > generally not a pleasant exercise. You don't have...

On Fri, Jan 15, 2010 at 08:33:52AM -0700, Peter Ehlers wrote: > Why would anyone complain? You're free to call it 'applesauce' > if that suits you. Good idea, I will do this from now on! ;-) > What do you...

On Wed, Sep 29, 2010 at 1:58 PM, Michael Bedward <michael.bedward at gmail.com> wrote: > How is your C coding ? Bill ? Anyone else ? ?I could have a got at > writing some prototype code to test in the next...

On Wed, Nov 25, 2009 at 7:03 PM, Titus Malsburg <malsburg at gmail.com> wrote: > ?I was expecting > that this should plot the panels in the order in which the levels > occur in the data frame: > > ?xyplot(dur~roi...

On Fri, Jan 15, 2010 at 09:19:23AM -0500, David Winsemius wrote: > > On Jan 15, 2010, at 5:59 AM, Titus von der Malsburg wrote: > > >Mean and variance of Poisson distributed data are specified by \rho. > >How can I...

The documentation of xyplot could be improved here. It says: "If 'index.cond' is a list, it has to be as long as the number of conditioning variables, and the 'i'-th component has to be a valid indexing vector...

Hi list, I want to place a plot (eg "plot(1:10)") and a xyplot side by side in one figure. The two columns should have different widths. If I'm not missing something, this rules out the standard way...

On Tue, Nov 9, 2010 at 6:05 PM, Michael Larkin <mlarkin at rsmas.miami.edu> wrote: > I am assuming there is a package that I need to load. ?I looked at the list > of packages and I can't...

Hi list! I have a large matrix which I'd like to partition into blocks and for each block I'd like to compute the mean. Following a example where each letter marks a block of the partition: a a...

On Tue, Jun 09, 2009 at 04:39:29PM +0200, Titus von der Malsburg wrote: > > is there a way to plot both of them in one plot, so that the bars for > > value "1" (dataA: 3, dataB: 5) would appear...

On 2014-04-28 Mon 12:31, Caroline Lustenberger <caroline.lustenberger at hotmail.com> wrote: > mod_Knmn<-lmer(Knmn~Group*Timepoint+(1|VPnr),data=data) > > When performing a qq-plot my residuals are clearly deviant from the > norm (long-tailed...