KD Makatjane | 24 Apr 20:26 2014
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Re: instal tar.gz package on windows

Good evening sir/madam
My name is katleho makatjane. I am currently a B.com statistics student at North West University Mafikeng
campus.  I have installed R 3.1.0 on my laptop but my main problem is to install all necessary packages so
that I may be able to start using it for my analysis. It gives me error while trying to install them from
downloaded files. And again it can connect to the internet to download them automatically. Can you please
help me out on how to install the R packages. I am using a 32bit windows 7 ultimate operating system

Yours faithfully

Katleho Makatjane
North West University
Mafikeng Campus
Department of Statistics and Economics
Contact: +27734630271

 
Vrywaringsklousule / Disclaimer:  http://www.nwu.ac.za/it/gov-man/disclaimer.html 
Good evening sir/madam
My name is katleho makatjane. I am currently a B.com statistics student at North West University Mafikeng
campus.  I have installed R 3.1.0 on my laptop but my main problem is to install all necessary packages so
that I may be able to start using it for my analysis. It gives me error while trying to install them from
downloaded files. And again it can connect to the internet to download them automatically. Can you please
help me out on how to install the R packages. I am using a 32bit windows 7 ultimate operating system

Yours faithfully

Katleho Makatjane
North West University
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Verena Weinbir | 24 Apr 14:15 2014
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Metafor: How to integrate effectsizes?

Hello!

I am using the metafor package for my master's thesis as an R-newbie. While
calculating effectsizes from my dataset (mean values and
standarddeviations) using "escalc" shouldn't be a problem (I hope ;-)), I
wonder how I could at this point integrate additional studies, which only
state conhens d (no information about mean value and sds available), to
calculate an overall analysis.  I would be very grateful for your support!

Best regards,

Verena

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Noah Silverman | 24 Apr 19:20 2014

Perceptual Mapping

Hi,

Someone just asked me to analyze a fairly large data set using something
they called "perceptual mapping".  I'm not familiar with the term, but a
quick check in Google seems to indicate that it is just another term for
Multidimensional Scaling.  However, they insist that it is something
different.

Is anybody here familiar with "perceptual mapping" with multidimensional
data?  If so, can you point to me to any examples using R?

Thanks,

--

-- 
*Noah Silverman, PhD* | UCLA Department of Statistics
8117 Math Sciences Building, Los Angeles, CA 90095

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Vishal Chari | 24 Apr 13:04 2014
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Unable to install rqpd

Hello,

 I am unable to install package rqpd. I have also tried to download for source but not able to do so.
Please help

thank in advance
regards
vishal

Nasrin Pak | 24 Apr 16:55 2014
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Remove top values from a data set

Hi all;

I have a data set that I want to remove the top values above 90th
percentile from it. Any suggestions?

Thank you;

--

-- 

*Nasrin Pak, MSc*

Air Quality Scientist

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Kumar Mainali | 24 Apr 18:44 2014
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mvpart question - how to calculate deviance explained by variables?

​library(mvpart)

The r code I used:

mvpart(ept~cond+phlab+doc+episub+embed+woodtot+shade+Q+stgrad+veldpth,
data=mydata, method="anova", xv="1se", xval=5, xvmult=1000)​

Part of the tabular output of the tree:

*1) root 295 3905.9860 4.806780 *

*   2) cond>=194.15 77  491.2468 2.493506 *

     4) cond>=309.7 25   62.1600 1.440000 *

     5) cond< 309.7 52  388.0000 3.000000 *

*   3) cond< 194.15 218 2857.1560 5.623853 *

     *6) embed>=82.5 114  891.9649 4.017544  *

Is there a convenient way to calculate the deviance explained by each
variables? For instance, I did it manually for one variable in one split as
below:
the deviance explained by cond =
*1 – (2857+491)/3905.98 = 0.1426*

Thank you.

- Kumar Mainali
(Continue reading)

Tom Wright | 24 Apr 17:45 2014

Fast way to populate a sparse matrix

I need to generate a sparse matrix. Currently I have the data held in two
regular matrices. One 'targets' holds the column subscripts while the other
'scores' holds the values. I have written a 'toy' sample below. Using this
approach takes about 90 seconds to populate a 30000 x 30000 element matrix.
I'm going to need to scale this up by a factor of about 1000 so I really
need a faster way of populating the sparse matrix.
Any advice received gratefully.

# toy code starts here

require('Matrix')
set.seed(0)

adjM<-Matrix(0,nrow=10,ncol=10)

#generate the scores for the sparse matrix, with the target locations
targets<-matrix(nrow=10,ncol=5)
scores<-matrix(nrow=10,ncol=5)
for(iloc in 1:10)
  {
  targets[iloc,]<-sample(1:10,5,replace=FALSE)
  scores[iloc,]<-rnorm(5)
  }

#populate the sparse matrix
for(iloc in 1:10)
  {
  adjM[iloc,targets[iloc,!is.na(targets[iloc,])]]<-scores[iloc,!is.na
(targets[iloc,])]
  }
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Preetam Pal | 24 Apr 14:49 2014
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CHAID in R

Hi,
I want to implement CHAID in R, but at this point am not sure how to go
about it.
Would be glad if someone please helps me out with it. I am attaching the
data set for your perusal.
The variable in the 1st column is the dependent variable.
Thanks,
Preetam

-- 
Preetam Pal
(+91)-9432212774
M-Stat 2nd Year,                                             Room No. N-114
Statistics Division,                                           C.V.Raman
Hall
Indian Statistical Institute,                                 B.H.O.S.
Kolkata.
Hi,
I want to implement CHAID in R, but at this point am not sure how to go
about it.
Would be glad if someone please helps me out with it. I am attaching the
data set for your perusal.
The variable in the 1st column is the dependent variable.
Thanks,
Preetam

--

-- 
Preetam Pal
(Continue reading)

Michael Dewey | 24 Apr 14:19 2014
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Re: metafor - rstudent(res) - omitted rows

At 11:56 22/04/2014, Dipl. Kfm Dominik Wagner MSc; MSc wrote:
>Dear all,
>
>I am quite new to R. Now my following easy question.
>
>I use metafor and performed an outlier test with rstudent(res).
>This is resulting in 1000 rows of 1578 and 578 omitted rows (starting with
>row 598).
>
>
>    1. How can I display all 1578 rows in R-studio? Because in the
>    standardized residual plot it starts with study 1 (see attachment). In
>    R-studio with row 598.
>    2. How can I just plot the standardized residuals with manipulated
>    x-axis to see every single study?

I cannot help with your Rstudio probelm as I do not use it but as far 
as your plotting question is concerned:

1 - do you really want to see all of the residuals? Why not just keep 
the ones outside the range -2 to +2 which you might then need to study further
2 - the pictures would probably be clearer if you identify and do not 
print out the two studies with r very close to -1 as they are 
compressing everything else
3 - hollow circles are often a good idea when you have overprinting.

>Thank you very much for your help.
>
>Cordially
>
(Continue reading)

Mohammed Ouassou | 24 Apr 12:31 2014
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Cramer Rao upper bound computation

 Dear R users;

I have a question about Cramer Rao upper/lower bounds

Is it possible to compute Crammer Rao upper/lower bounds from residuals
and  corresponding covariance matrices ?

Any suggestions will be appreciated, thanks in advance.

M.O

Dr Eberhard Lisse | 24 Apr 02:21 2014

INET_NTOA equivalent?

In MySQL

	SELECT INET_ATON('127.0.0.1')

returns the integer 2130706433

Is there a function in R to reverse that, ie so that something like

	ip <- inet_ntoa(2130706433)

would put  '127.0.0.1' into ip?

greetings, el


Gmane