?try is your friend here.
On Sat, 21 Jun 2003, Jonck van der Kogel wrote:
> Hi all,
> I am momentarily experimenting with Silhouette from the cluster library
> but I am getting some errors. Since Silhouette can be seen as a quality
> measure for a clustering what I want to do is run a series of
> > "Monotonic Multigamma run (" * n == len * ", " * theta == t1 *
> >
> > Is this a valid expression? My understanding of an expression is that it
> > contains one more more statements.
>
> That's only part of the expression. This is the full expression
> "Monotonic Multigamma run (" * n == l
On Fri, 20 Jun 2003, Faheem Mitha wrote:
>
>
> On Fri, 20 Jun 2003, Uwe Ligges wrote:
>
> >
> > t1 <- theta # you cannot use theta as variable and math. symbol
> > plot(1:10, main =
> >substitute("Monotonic Multigamma run (" * n == len * ", " *
> > theta == t1 * ").", list(len = len,
Hi,
I know that is not possible make a stepwise procedure using REML in R, I can
use ML for this.
For nested design it may be very dangerous due the difference in variance
structure, mainly in a splitplot design. ML make significative variables that
REML dont make.
I read an article that is m
I have been using the negative binomial regression function in the MASS
library to generate incidence rate ratios and confidence intervals.
Can this function also generate a gradient value that would estimate
the slope between the dependent and independent variables? or can it
be generated by
On Fri, 20 Jun 2003, Uwe Ligges wrote:
> Faheem Mitha wrote:
[snip]
> > main=paste("Monotonic Multigamma run (n=",
> > deparse(substitute(len)),", ",
> > expression(theta),"=", deparse(substitute(theta)),").")
>
> No, it won't work that way, because you have to specify an S expression
> in order
Hi all,
I am momentarily experimenting with Silhouette from the cluster library
but I am getting some errors. Since Silhouette can be seen as a quality
measure for a clustering what I want to do is run a series of different
clusterings and store the one with the highest Silhouette value. In
tha
Consider the following:
> library(MASS)
> Dat <- data.frame(x1=rnorm(9), x2=rnorm(9), y1=rnorm(9), y2=rnorm(9))
> mdl <- "~x1+x2+I(x1^2)+I(x2^2)+x1:x2"
> y <- names(Dat)[3:4]
> fits <- list()
> for(i in 1:2){
+ fit0 <- lm(formula(paste(y[i], "~1")), Dat)
+ fits[[i]] <- stepAIC(fit0, mdl)
+ }
Sta
Hi,
exist in R any glmm function that have any tools for test for overall goodness
of fit?
Thanks
Ronaldo
--
O papel da impressora é sempre mais forte na parte picotada.
--
| // | \\ [***]
|> ( õ õ ) [Ronaldo Reis Júnior]
| V [UF
Try,
help.search("stepwise")
It brings up the functions step() and stepAIC() from MASS.
Andrew Taylor wrote:
Hi,
S-PLUS includes the function "stepwise" which can use a variety of
methods to conduct stepwise multiple linear regression on a set of
predictors. Does a similar function exist in R?
Have you considered stepAIC in library(MASS) or step?
hth. spencer graves
Andrew Taylor wrote:
Hi,
S-PLUS includes the function "stepwise" which can use a variety of
methods to conduct stepwise multiple linear regression on a set of
predictors. Does a similar function exist in R? I'm having d
Hi,
S-PLUS includes the function "stepwise" which can use a variety of
methods to conduct stepwise multiple linear regression on a set of
predictors. Does a similar function exist in R? I'm having difficulty
finding one. If there is one it must be under a different name because
I get an error m
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>See the attached file for details.
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On 20-Jun-03 Ted Harding wrote:
> Sorry to raise what has probably been discussed before,
> but I an repeatedly struck by the comparative slowness
> of S-plus for Windows compared with R for Linux when doing
> much the same thing.
Thanks to all who so promptly responded with comments and informati
On Fri, 20 Jun 2003, Prof Brian Ripley wrote:
> Might it help to note that the version of MASS which shipped with 1.7.0
> didn't get the import of biplot from mva right? I think this was what
> happened with that version of VR.
I upgraded to R-1.7.1 and now the old .RData file loads when I star
On Fri, 20 Jun 2003, Uwe Ligges wrote:
> (Ted Harding) wrote:
> > Hi Folks,
> >
> > Sorry to raise what has probably been discussed before,
> > but I an repeatedly struck by the comparative slowness
> > of S-plus for Windows compared with R for Linux when doing
> > much the same thing.
> >
> > I
(Ted Harding) <[EMAIL PROTECTED]> writes:
> My instincts say that "WIndows" is probably a significant
> factor in the comnparison, but still ...
>
> Ideally, to compare R with S-plus, one should look at them
> both on the same OS (Unix or Windows) on the same machine.
>
> Can anyone give me clean
Hello,
I have a simulated data structure in which students are nested within
teachers, and with each student are associated two test scores. There
are 20 classrooms and 25 students per classroom, for a total of 500
students and two scores per student. Here are the first 10 lines of
my dataframe
You will find a speed comparison of S-PLUS and R, but also Matlab, Octave,
Scilab, Ox and O-Matrix under Windows at
http://www.sciviews.org/other/benchmark.htm. It seems that, at least under
Windows your impressions are confirmed. Also, I measured that R is a little
bit faster under Linux Mandrake
Have you looked at coef(lm (log10(vouty) ~ log10(voutx)))? This the
slope / coefficient of log10(voutx) should be an estimate of the power.
Why do yo think the exponent is wrong? If the plot looks like a
rough ellipse, then this is a standard way to fit this.
This assumes that log10(
(Ted Harding) wrote:
Hi Folks,
Sorry to raise what has probably been discussed before,
but I an repeatedly struck by the comparative slowness
of S-plus for Windows compared with R for Linux when doing
much the same thing.
I don't have a direct comparison, because they're not
running on the same ma
Hi Folks,
Sorry to raise what has probably been discussed before,
but I an repeatedly struck by the comparative slowness
of S-plus for Windows compared with R for Linux when doing
much the same thing.
I don't have a direct comparison, because they're not
running on the same machine; but machine W
On Fri, 20 Jun 2003, Göran Broström wrote:
> This happened to me with R-1.7.0, Linux RH9:
>
> --
> > q()
> Save workspace image? [y/n/c]: y
> Warning messages:
> 1: namespaces may not be available when loading
> 2: names in persist
I am having difficulty with the calculation of the power law exponent
for set of nodes within a graph.
Specifically, I am interested in the distribution of in-degree and
out-degree among communities of web pages where the web pages are the
nodes of the graph and the hyperlinks the edges.
Accordi
I think you have saved in your workspace an object whose environment is
a namespace, probably mva, that is not available when .RData is loaded but
is once the session is running.
On Fri, 20 Jun 2003, Göran Broström wrote:
> This happened to me with R-1.7.0, Linux RH9:
>
> --
This happened to me with R-1.7.0, Linux RH9:
--
> q()
Save workspace image? [y/n/c]: y
Warning messages:
1: namespaces may not be available when loading
2: names in persistent strings are currently ignored
[EMAIL PROTECTED]:~/R/t
Faheem Mitha wrote:
Dear People,
I need to make a label which both contains math notation as well as
substitutes a value for an object. In the following label, len and theta
are one dim variables, and I am substituting their values appropriately.
This label looks fine except that I want the greek
On Fri, 20 Jun 2003, Faheem Mitha wrote:
> Hmm. Tried this, didn't work either. Inspired by pg 32 of "R for
> Beginners".
>
> main=paste("Monotonic Multigamma run",
>as.expression(substitute(n==length,list(length=len))),
>as.expression(substitute(theta==th,list(th=theta)
On Fri, 20 Jun 2003, Faheem Mitha wrote:
>
> Dear People,
>
> I need to make a label which both contains math notation as well as
> substitutes a value for an object. In the following label, len and theta
> are one dim variables, and I am substituting their values appropriately.
> This label loo
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