#0177

Mean by Group With aggregate in R

EasyR15 min10 XP

Problem

Given a data frame with team and score, return mean score per team.

Before tidyverse, base R aggregate is the simplest way to summarize data by group.

Example 1

InputA scores 10 and 20; B score 30

OutputA mean 15, B mean 30

aggregate applies mean separately inside each team.

CodeR

df <- data.frame(team = c("A", "A", "B"), score = c(10, 20, 30))

# write your code here

df <- data.frame(team = c("A", "A", "B"), score = c(10, 20, 30))

# write your code here

Visible browser tests run here when available.

Testcases1 visible / 3 hidden categories

Core example

InputA scores 10 and 20; B score 30

ExpectedA mean 15, B mean 30

aggregate applies mean separately inside each team.

Hidden Test Categories

empty or minimal inputduplicates or tieslarger input