Displaying 20 results from an estimated 41 matches for "adai".

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2005 Aug 15

2

stepAIC invalid scope argument

...ale)
3: addterm.lm(fit, scope$add, scale = scale, trace = max(0, trace - 1), k = k, ...)
2: addterm(fit, scope$add, scale = scale, trace = max(0, trace - 1), k = k, ...)
1: stepAIC(mid, scope = list(upper = ~x1 + x2 + x3, lower = ~1))
Any pointers would be much appreciated. Thank you.
Regards, Adai

2005 Sep 02

1

C-index : typical values

...0.031 0.025 0.006 0.023 200
1) Am I correct in assuming C-index = 0.5 * ( Dxy + 1 ) ?
2) If so, I am getting 0.5*(-0.3634+1) = 0.318 for the C-index. Does
this make sense ?
3) Should I be using some other measurement instead of C-index.
Thank you very much in advance.
Regards, Adai

2005 Feb 25

2

display full form in args

...dig.lab = 3, ...)
But sometimes I cannot use this workaround. e.g. args(merge.default)
does not give the full form as in the help file.
I find it almost always useful to see the full form. Is there a more
reliable workaround or do I have to look up the help to be certain.
Thank you.
Regards, Adai

2005 Jul 25

5

passing formula arguments cv.glm

...:
Object "formu" not found
I think this has something to do with formula and environments but I do
not know enough to solve it myself. I searched the archive without much
help (perhaps I was using the wrong keywords).
Any help would be very much appreciated. Thank you.
Regards,
--
Adaikalavan Ramasamy ramasamy at cancer.org.uk
Centre for Statistics in Medicine http://www.ihs.ox.ac.uk/csm/
Wolfson College Annexe Tel : 01865 284 408
Linton Road, Oxford OX2 6UD Fax : 01865 284 424

2008 Aug 25

3

Maintaining repeated ID numbers when transposing with reshape

I have a dataset in "long" format that looks something like this:
ID TEST RESULT
1 A 17
1 A 12
1 B 15
1 C 12
2 B 8
2 B 9
Now what I would like to do is transpose it like so:
ID TEST A TEST B TEST C
1 17 15 12
1 12 . .
2

2008 Aug 24

1

howto optimize operations between pairs of rows in a single matrix like cor and pairs

...NA 18.9 18.9 19.7
3 NA NA NA 18.8 19.6
4 NA NA NA NA 19.6
5 NA NA NA NA NA
Can I use apply() or any of it's family to optimize the codes? I have
tried playing around with outer, kronecker, mapply without any sucess.
Any suggestions? Thank you.
Regards, Adai

2005 Aug 08

3

use different symbols for frequency in a plot

suppose I have the following data
x<-c(rep(.1,5),rep(.2,6),rep(.4,10),rep(.5,20))
y<-c(rep(.5,3),rep(.6,8),rep(1.2,8),rep(2.5,18),rep(3,4))
If I plot(x,y) in R, I will only get seven distinct
points. What I want to do is to use different symbols
to show the frequency at each point.
e.g. if the frequncey is between 1 and 5, then I plot
the point as a circle; if the frequency is between 6

2008 Sep 17

3

unix-type commandline keystrokes in the windows RGUI

Hi all,
I am generally quite fond of the unix commandline keystrokes (e.g. searching
back in your history with [CTRL]-R, and cutting/pasting with [CTRL]-K/Y)
which work in the R commandline in *nix. Does anyone know if there's any
way to get similar functionality in the Windows RGUI?
I know that as of now, [CTRL]-A and -E do the same as unix (beginning and
end of line) and [CTRL]-Y

2002 Sep 02

1

Coplot graph size manipulation

...(I have already set the option show.given = F)
and less importantly ...
c) How does one change the labels on the sub-axis (either x of y) to a
given vector.
d) How to rotate the axis label 45 degree counter clockwise. I tried
par(las=1.5) etc without much luck.
Many thanks in advance.
Regards, Adai.
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Send "info", "help", or "[un]subscribe"
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2006 Feb 06

1

Evaluate output after each rep()

Hi R-Help,
I'm trying a develop a test simulation where i evaluate the probability
of not getting a value of 100 from the function rbinom(6000, 200, .5)
[indeed, a very small probability]. At the end of each rep, I would
like to evaluate the output, continue with the loop if the output
contains the value 100, stop if the output lacks a 100.
How do I get R to evaluate the output after

2002 Jul 26

0

Parzen Windows

...this was available at one
time in ksmooth() in S(plus).
Cheers,
Andy
> From: ripley at stats.ox.ac.uk [mailto:ripley at stats.ox.ac.uk]
>
> Parzen windows is an engineer's term for kernel density estimation.
> So, see packages KernSmooth, sm, ....
>
> On Fri, 26 Jul 2002, Adaikalavan Ramasamy wrote:
>
> > Does anyone know if there is a function in R that fits a
> Parzen Window ?
> >
> > I have searched the mail archives and the packages to no
> avail. Perhaps it
> > has a different name or implemented differently. I do not
> mind t...

2002 Aug 12

0

Attaching marginal summary plots to the main matrix plot

...e final example does pretty
much what you're asking about (with a scatterplot and histograms, but the
idea should be the same).
Hope this helps,
Matthew Wiener
Applied Computer Science & Mathematics Dept.
Merck Research Labs
Rahway, NJ 07090
732-594-5303
-----Original Message-----
From: Adaikalavan Ramasamy [mailto:ramasamy at stats.ox.ac.uk]
Sent: Monday, August 12, 2002 5:27 AM
To: r-help at stat.math.ethz.ch
Subject: [R] Attaching marginal summary plots to the main matrix plot
Dear helplist, I am trying to visualise a datamatrix together with its
marginal densities.
Suppose dat &l...

2004 Aug 15

1

index and by groups statement

Dear R-users
Im working with a dataset that contains information
for 8 groups of data and I need to select a sample of
certain size (100 cubic feet by group) from this
database for each of these 8 groups. To clarify, here
is the starting code Im working with:
k<-nrow(dataset)
ix<-sort(runif(k),index.return=TRUE)$ix
M<-max(which(cumsum(dataset$volume[ix])<100))+1

2005 Feb 24

3

a simple question

Dear All,
I need to separate one column which is in a format like, "can_region",
into two columns like, "can", and "region". Do we have a function in R
to do this? Thanks.
Regards,
Jin
[[alternative HTML version deleted]]

2005 Jul 19

3

R: expression

hi all
i am having a problem with the expression/paste command
say we estimate a variable, named PHI
it contains the value of say 2
and we want to display this value as " hat(phi) = PHI" onto a graphic
i.e. " hat(phi)=2 "
how does one do this?
i've tried the following:
1. legend(-5,.3,expression(hat(phi)*"="*PHI))
2.

2007 Jul 26

1

princomp error

I am attempting to run principal components analysis on a dataset of
spectral reflectance (6 decimal places). I imported the data using
read.table and there are both column and row headers. When I run
princomp I receive the following error:
Error in cov.wt(z) : 'x' must contain finite values only
Where am I going wrong?
Ross

2010 Jan 22

1

lm on group

Hi all,
I have a quick question about lm on group, say I have:
x <- 1:10
y <- x*3
buckets <- seq(0, 10, by=5)
g <- cut(x, buckets)
summary(lm(y ~ g - 1))
Coefficients:
Estimate Std. Error t value Pr(>|t|)
g(0,5] 9.000 2.121 4.243 0.00283 **
g(5,10] 24.000 2.121 11.314 3.35e-06 ***
What is it doing exactly? I guess the

2007 May 20

0

optional fields in function declarations; Solved

thank you to both Adaikalavan and Patrick.
on the basis of Adaikalavan example this is an example that point out my problems.
>log_raise=function(num, exp, base){return(log(num^exp,base))}
I would like to have optional fields, so some settings to be default parameters;
if I declare the function as above the opera...

2006 Feb 21

6

How to Import Data

Hello,
I am a very new user of R. I've spent several hours trying to import
data, so I feel okay asking the list for help. I had an Excel file,
then I turned it into a "csv" file, as instructed by directions. My
filename is "x111.csv." I then used the following commands to read this
(fairly small) dataset in.
x111 <-read.table(file='x111.csv',

2008 Sep 14

2

histogram

i calculated the density and wanna do something like this
separate in 0-19-29-39-49-59-69-79-99
and put in these spaces 8 densities .. 0.something
i have the frequency in % and divided already in 20 or 10 to get the density
i tried and tried..made breaks vector to separate but couldn't put the other
vector with the frequency density onit directly
anyone know how to do it??
tks