R-Beginner: How to seperate to groups

[andresrcs]

As an R beginner you need to learn how to properly ask for help, this FAQ is going to help you with that.

FAQ: What's a reproducible example (`reprex`) and how do I create one?

Why reprex? Getting unstuck is hard. Your first step here is usually to create a reprex, or reproducible example. The goal of a reprex is to package your code, and information about your problem so that others can run it and feel your pain. Then, hopefully, folks can more easily provide a solution. What's in a Reproducible Example? Parts of a reproducible example: background information - Describe what you are trying to do. What have you already done? complete set up - include any library() calls and data to reproduce your issue. data for a reprex: Here's a discussion on setting up data for a reprex make it run - include the minimal code required to reproduce your error on the data…

Having that said, this is one example of how you could solve your problem applied to the iris dataset

library(dplyr)
iris %>% 
    group_by(Species) %>% 
    summarise(Sepal.Length = mean(Sepal.Length), Sepal.Width = mean(Sepal.Width)) %>% 
    mutate(group = ifelse(Sepal.Length > Sepal.Width, "A", "B"))
#> # A tibble: 3 x 4
#>   Species    Sepal.Length Sepal.Width group
#>   <fct>             <dbl>       <dbl> <chr>
#> 1 setosa             5.01        3.43 A    
#> 2 versicolor         5.94        2.77 A    
#> 3 virginica          6.59        2.97 A

^{Created on 2019-01-10 by the reprex package (v0.2.1)}