Help file ?ave should apply here.
Please read the Posting Guide mentioned in the footer of every email on this
list and on the list manager page for this mailing list. It warns you to read
the archives before posting and to post in plain text format rather than HTML
format.
---------------------------------------------------------------------------
Jeff Newmiller The ..... ..... Go Live...
DCN:<jdnewmil at dcn.davis.ca.us> Basics: ##.#. ##.#. Live
Go...
Live: OO#.. Dead: OO#.. Playing
Research Engineer (Solar/Batteries O.O#. #.O#. with
/Software/Embedded Controllers) .OO#. .OO#. rocks...1k
---------------------------------------------------------------------------
Sent from my phone. Please excuse my brevity.
On November 10, 2014 6:39:47 AM PST, David Studer <studerov at gmail.com>
wrote:>Hi everyone!
>
>I have problems finding a solution to the following two problems:
>
>My sample-dataframe consists of two variables "group" and
"value":
>
>group<-c("A", "A", "A", "B",
"B", "B", "B", "C")
>value<-c(1,3,2,2,2,4,4,1)
>df<-as.data.frame(cbind(group, value))
>
>Problem 1:
>**********
>
>Now I'd like to count the number of group-A-cases, group-B-cases etc
>and
>write
>this number into a new column. It should be like:
>
>count_group<-c(3, 3, 3, 4, 4, 4, 4, 1)
>
>Problem 2:
>***********
>
>I'd like to add new column with the mean values (or any other function)
>within
>my groups. E.g:
>
>Group A: (1+3+2)/3=2
>Group B: (2+2+4+4)/4=3
>Group C: =1
>
>Now I'd add another column 2 2 3 3 3 3 1
>
>
>Can anyone help me, how this can be done best?
>
>Thank you!
>David
>
> [[alternative HTML version deleted]]
>
>______________________________________________
>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.