[R] summary statistics for grouped data

[William Revelle]

At 6:44 PM +0100 2/12/10, Søren Højsgaard wrote:
>You might find the summaryBy function in the doBy package useful.
>Regards
>Søren

see also the describe.by function in the psych package.

>________________________________________
>Fra: r-help-bounces at r-project.org 
>[r-help-bounces at r-project.org] På vegne af 
>jose romero [jlaurentum at yahoo.com]
>Sendt: 12. februar 2010 18:23
>Til: r-help at r-project.org
>Emne: [R] summary statistics for grouped data
>
>Hello list:
>
>Is there an easy way (preferably through one of 
>the standard R packages) of obtaining summary 
>statistics for grouped data? I could split the 
>data into classes by hist, and then 
>progressively calculate all the "columns" i need 
>to obtain the mean and standard deviation, but i 
>was looking for a single function that could do 
>that with a data vector.
>
>Thanks in advance,
>
>jose romero
>
>
>         [[alternative HTML version deleted]]
>
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