R help - Jul 2008 - applying complex functions by groups

Hi,

I have a matrix that is indexed by groups and looks something like this:

1 1 2
1 2 1
.
.
.
2 1 1
2 1 2
2 NA 1
.
.
.
3 1 NA
3 2 NA
etc.

The first column is the group variable and I would like to apply categorical
data imputation functions to the other two columns, doing so by groups.  I have
tried APPLY, BY and SPLIT, but have not had much luck getting it to work.  I
wonder if anyone has suggestions for how I might do this kind of by groups
processing.  Thanks very much.

Holmes


Holmes Finch
Associate Professor
Director of Research, Office of Charter School Research
Department of Educational Psychology
Ball State University
Muncie, IN  47306
(765) 285-3668

My favorite quote:

"I was gently accused of escapism during a TV interview about a book I had
written on my length-of-California walk. Frankly, I fail to see how going for a
six-month, thousand-mile walk through deserts and mountains can be judged less
real than spending six months working eight hours a day, five days a week, in
order to earn enough money to be able to come back home to a comfortable home in
the evening and sit in front of a TV screen and watch the two-dimensional image
of some guy talking about a book he has written on a six-month, thousand-mile
walk through deserts and mountains."

Colin Fletcher (1922-2007), renowned hiker and outdoor writer

can you  provide commented, minimal, self-contained, reproducible
code.  Exactly what statements are you using.  Normally I would use
'split' to partition the data and then 'lapply' to work on each
of the
groups.  An idea of what type of processing you have tried and what
your expectation of output (given a specific input) would be.

On Mon, Jul 14, 2008 at 10:39 AM, Finch, W. Holmes <whfinch at bsu.edu>
wrote:
> Hi,
>
> I have a matrix that is indexed by groups and looks something like this:
>
> 1 1 2
> 1 2 1
> .
> .
> .
> 2 1 1
> 2 1 2
> 2 NA 1
> .
> .
> .
> 3 1 NA
> 3 2 NA
> etc.
>
> The first column is the group variable and I would like to apply
categorical data imputation functions to the other two columns, doing so by
groups.  I have tried APPLY, BY and SPLIT, but have not had much luck getting it
to work.  I wonder if anyone has suggestions for how I might do this kind of by
groups processing.  Thanks very much.
>
> Holmes
>
>
> Holmes Finch
> Associate Professor
> Director of Research, Office of Charter School Research
> Department of Educational Psychology
> Ball State University
> Muncie, IN  47306
> (765) 285-3668
>
> My favorite quote:
>
> "I was gently accused of escapism during a TV interview about a book I
had written on my length-of-California walk. Frankly, I fail to see how going
for a six-month, thousand-mile walk through deserts and mountains can be judged
less real than spending six months working eight hours a day, five days a week,
in order to earn enough money to be able to come back home to a comfortable home
in the evening and sit in front of a TV screen and watch the two-dimensional
image of some guy talking about a book he has written on a six-month,
thousand-mile walk through deserts and mountains."
>
> Colin Fletcher (1922-2007), renowned hiker and outdoor writer
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?