[R] should I use rbind in my example?

[David Freedman]

Are you sure that you want to loop over variables for each subset, and do
this within each subset?  A simple way to generate summary statistics
(across variables and within categories) is the summaryBy function in the
doBy package:

d=data.frame(wt=rnorm(100,100,10),ht=rnorm(100,2,1),sex=gl(2,1,100))
library(doBy)
summaryBy(wt+ht~sex,da=d,FUN=c(mean,sd))

David Freedman


SNN wrote:
> 
> 
> Hi,
> 
> This is just for print out so it looks nice. what I have is a loop that
> loops over my variables and calculates the mean and the sd for these
> variables. Then I need to rbind them so I can stack them up in one file.
> the problem is that only the fist header appears and the rest do not. this
> is because I used rbind.
> 
> I am new into R , can you tell me how you put them in a 'list'?.
> 
> Thanks
> 
> 
> 
> 
> jholtman wrote:
>> 
>> What do you want to do with it?  Is this just for printing out? What
>> other types of transformations are you intending to do?  Why not just
>> put them in a 'list' and then write your own specialized print
>> routine.
>> 
>> On Wed, Jan 21, 2009 at 10:30 AM, SNN <s.nancy1 at yahoo.com> wrote:
>>>
>>> Hi,
>>>
>>> I need to rbind two data frames. Each one has a header . after the rbind
>>> I
>>> would like to keep the header for each and have the two data frames
>>> separated by a line. Is this possible to do in R?
>>>
>>>  For example
>>>
>>>  weight_mean    weight_sd.dev
>>>>  F 14.33333  4.932883
>>>> M 34.66667 10.692677
>>>>
>>>>    hight_mean    hight_sd.dev
>>>> F 35.00000  7.071068
>>>> M 34.66667 10.692677
>>>
>>>
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>>>
>>> ______________________________________________
>>> 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 that you are trying to solve?
>> 
>> ______________________________________________
>> 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.
>> 
>> 
> 
> 

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