[R] by group

[Bert Gunter]

... maybe not. According to Rdocumentation.org:

reshape2's status is:

reshape2 is retired: only changes necessary to keep it on CRAN will be
made. We recommend using tidyr <http://tidyr.tidyverse.org/> instead.


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Mon, Nov 1, 2021 at 5:55 PM Rasmus Liland <jral using posteo.no> wrote:

> Dear Val,
>
> also consider using reshape2::dcast
>
>         dat <- structure(list(Year = c(2001L,
>         2001L, 2001L, 2001L, 2001L, 2001L,
>         2002L, 2002L, 2002L, 2002L, 2002L,
>         2002L, 2003L, 2003L, 2003L, 2003L,
>         2003L, 2003L), Sex = c("M", "M", "M",
>         "F", "F", "F", "M", "M", "M", "F", "F",
>         "F", "M", "M", "M", "F", "F", "F"), wt =
>         c(15L, 14L, 16L, 12L, 11L, 13L, 14L,
>         18L, 17L, 11L, 15L, 14L, 18L, 13L, 14L,
>         15L, 10L, 11L)), class = "data.frame",
>         row.names = c(NA, -18L))
>
>         reshape2::dcast(data=dat,
>                         formula=Year~Sex,
>                         value.var="wt",
>                         fun.aggregate=mean)
>
> yielding
>
>           Year        F        M
>         1 2001 12.00000 15.00000
>         2 2002 13.33333 16.33333
>         3 2003 12.00000 15.00000
>
> Best,
> Rasmus
>
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