Address new group_by %>% summarize warning message

[rudeboybert]

As noted on StackOverflow, as of dplyr v1.0.0 (I think), when running group_by() %>% summarize(), a message is now outputted (see reprex below):

`summarise()` ungrouping output (override with `.groups` argument)

This message is not addressed in the v1 print edition of the book. To keep moderndive.com consistent with the print edition, for now we set options(dplyr.summarise.inform = FALSE) in index.Rmd

For v2:

• Remove this option()
• Explicitly address this in the text for Ch3 Data Wrangling.

reprex:

library(dplyr)
#> 
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#> 
#>     filter, lag
#> The following objects are masked from 'package:base':
#> 
#>     intersect, setdiff, setequal, union
library(nycflights13)

weather %>% 
  group_by(month) %>% 
  summarize(mean = mean(temp, na.rm = TRUE))
#> `summarise()` ungrouping output (override with `.groups` argument)
#> # A tibble: 12 x 2
#>    month  mean
#>    <int> <dbl>
#>  1     1  35.6
#>  2     2  34.3
#>  3     3  39.9
#>  4     4  51.7
#>  5     5  61.8
#>  6     6  72.2
#>  7     7  80.1
#>  8     8  74.5
#>  9     9  67.4
#> 10    10  60.1
#> 11    11  45.0
#> 12    12  38.4

^{Created on 2020-06-08 by the reprex package (v0.3.0)}