[R] dplyr : row total for all groups in dplyr summarise

[maicel at infomed.sld.cu]

Thank you!!! It's what I needed.
best regard
Maicel Monzon, PHD
Centro Nacional de Ensayos Clinicos


Ulrik Stervbo <ulrik.stervbo en gmail.com> escribió:

> If you want the total number of rows in the original data.frame after
> counting the rows in each group, you can ungroup and sum the row counts,
> like:
>
> library("dplyr")
>
>
> mtcars %>%
>    group_by (am, gear) %>%
>    summarise (n=n()) %>%
>    mutate(rel.freq = paste0(round(100 * n/sum(n), 0), "%")) %>%
>    ungroup() %>%
>    mutate(row.tot = sum(n))
>
> HTH
> Ulrik
>
> On Mon, 4 Jul 2016 at 18:23 David Winsemius <dwinsemius en comcast.net> wrote:
>
>>
>> > On Jul 4, 2016, at 6:56 AM, maicel en infomed.sld.cu wrote:
>> >
>> > Hello,
>> > How can I aggregate row total for all groups in dplyr summarise ?
>>
>> Row total ? of what? Aggregate ? how? What is the desired answer?
>>
>>
>>
>> > library(dplyr)
>> > mtcars %>%
>> >  group_by (am, gear) %>%
>> >  summarise (n=n()) %>%
>> >  mutate(rel.freq = paste0(round(100 * n/sum(n), 0), "%"))
>> >
>> > best regard
>> > Maicel Monzon
>> >
>> >
>> >
>> > ----------------------------------------------------------------
>> >
>> >
>> >
>> >
>> > --
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>> ______________________________________________
>> R-help en r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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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