From: Jean Eid <jeaneid_at_chass.utoronto.ca>

Date: Sat 01 Oct 2005 - 01:18:09 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Oct 01 01:27:14 2005

Date: Sat 01 Oct 2005 - 01:18:09 EST

I do not totally understand your question as well. You seem to want a
descriptive statistic about a unitary number. What is the sd of a number?
or any other descriptive statictic. Maybe you mean for the columns or rows
or it could be that these are t-stats or z-stats that you need to get
p_values for them. In any case what I would do assuming that these tables
are in your env is the following

sapply(ls(), function(x){

nam <- paste(x,"_summary", sep="")

tt <- colMeans(get(x))

assign(nam, tt, pos=1)})

The function above will output a number of tables with their original name an extension _summary which contains the column means of the tables.

If you have the tables in different files on your box you need to add a read.table line above. and the function becomes

sapply(dir(), function(x){

nam <- paste(x,"_summary", sep="")

assign(x, read.table(x))

tt <- colMeans(x)

assign(nam, tt, pos=1)})

**HTH
**
On Fri, 30 Sep 2005, DAVID CAMACHO wrote:

> Thanks for your response,

*>
**> What I need is extremely simple. And I suppose there
**> are so many way to do it.
**> But as I have so many files to do it, I am looking for
**> the simplest way (if possible)
**>
**> What I meant was that I have tables with the same
**> numbers of rows and columns, (square form, should I
**> say?) like:
**>
**> 2,5,7
**> 3,4,8
**> 2,9,3
**>
**> 5,3,8
**> 2,5,5
**> 5,7,8
**>
**> But I have hundreds of this onces, (bigger once).
**> Every one of this tables have the same size (columns,
**> rows). And I want to obtain the sd, z-score, and
**> p-value for the position [1,1], [1,2]....
**> [2,1],[2,2]... etc etc. That is, to obtain a table
**> with some simple descriptive statistics about all this
**> tables.
**> I have try different methods, but I am no familiar
**> with R. (by the way, I could not find the way to do
**> loops with R)
**> Any suggestion is welcome.
**> David
**>
**>
**>
**>
**>
**> --- Berton Gunter <gunter.berton@gene.com> wrote:
**>
**> > I don't know what a "quadratic, same size" table is
**> > or what you mean. If you
**> > do not get a satisfactory reply I suggest:
**> >
**> > 1. Read and follow the posting guide at the end of
**> > this message.
**> >
**> > 2. In particular, provide a simple, reproducible
**> > example to show what you
**> > want to do and perhaps any error messages that you
**> > may have received.
**> >
**> >
**> > -- Bert Gunter
**> > Genentech Non-Clinical Statistics
**> > South San Francisco, CA
**> >
**> >
**> > > -----Original Message-----
**> > > From: r-help-bounces@stat.math.ethz.ch
**> > > [mailto:r-help-bounces@stat.math.ethz.ch] On
**> > Behalf Of DAVID CAMACHO
**> > > Sent: Thursday, September 22, 2005 9:10 AM
**> > > To: r-help@stat.math.ethz.ch
**> > > Subject: [R] Descriptive statistics for tables
**> > >
**> > >
**> > > I have a lot (more than one hundred) of files with
**> > tables of
**> > > the same kind (quadratic, same size) and I want to
**> > obtain
**> > > some statistics for every position on them.
**> > Therefore, as a
**> > > result I want another table. I import every table,
**> > and create
**> > > an object read.table for it, then I have try to
**> > create a
**> > > list or a data frame and directly utilize some
**> > functions
**> > > like sd( ) without success, because it calculate
**> > sd for the
**> > > columns . Which kind of object should I create
**> > in order to
**> > > utilize directly this kind of functions? Should I
**> > program it
**> > > throw for loops?
**> > >
**> > > David
**> > >
**> >
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
**>
*

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Oct 01 01:27:14 2005

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