[R] Tidyverse data frame conversion from monthly to annual

[Jeff Newmiller]

?summarise_all

See the examples.

On March 3, 2019 7:14:55 PM PST, phil using philipsmith.ca wrote:
>I have a data frame in which the first column is a sequence of monthly 
>dates and the other columns are variables. There are a great many 
>variables. I want to create another data frame similar to the first
>one, 
>but with annual values instead of monthly, created by summing the
>months 
>within each year.
>
>I am able to do this as shown in this reprex:
>
>library(tidyverse)
>REF_DATE <- seq(as.Date("2000/1/1"),by="month",length.out=36)
>set.seed(57)
>df <- data.frame(REF_DATE,
>                  x=sample(1:100,size=36),
>                  y=sample(1:100,size=36),
>                  z=sample(1:100,size=36),
>                  Year=year(REF_DATE))
>df1 <- df %>%
>   group_by(Year) %>%
>   summarise(x_a=sum(x),y_a=sum(y),z_a=sum(z)) %>%
>   ungroup()
>
>However, while this works for the simple case with only three
>variables, 
>I actually have many more than three, so I am looking for a more
>general 
>approach. I have no clue as to how to proceed. Any advice will be much 
>appreciated.
>
>Philip
>
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-- 
Sent from my phone. Please excuse my brevity.