How to Create an ID column in R and Randomly Assign data to groups

Question

I have a dataset called "SPIP5" in R that is just currently a list of 50 observations. Currently looking like:

Observations
20.46
3.08
2.07
18.2

I created a ID column by using;

data.frame <- tibble:: rowid_to_column(SPIP5, "ID")

This worked however, I don't know how to randomly assign the 50 observations between two groups and keep The IDs. Does any one have any recommendations.

I'm hoping for the dataset to look like this;

ID	Observation	Group (A or B
1	20.6	A
2	2.07	B
3	18.2	B
...	---	---

Answer 1

sample will help you assign two groups randomly.

SPIP5 <- tibble:: rowid_to_column(SPIP5, "ID")
SPIP5$Group <- sample(c('A', 'B'), nrow(SPIP5), replace = TRUE)

Answer 2

dplyr version

library(dplyr)

SPIP5 %>% mutate(ID = row_number(), Group = sample(LETTERS[1:2], as.numeric(n()), replace = T))