# ============================================================
# Data Frames in R
# R Foundations — Rverse Analytics
# https://rverseanalytics.com/learn/data-frames
# ============================================================

# Data Frames - R's spreadsheet
people <- data.frame(name = c("Ada", "Bo", "Cy"), age = c(35, 41, 29))
people
# 2. Pull a column with $
people$age
mean(people$age)
# 3. A built-in dataset: mtcars (32 cars)
head(mtcars[, 1:4])
nrow(mtcars)
# 4. Filter rows:  [rows, columns]
mtcars[mtcars$mpg > 25, 1:4]
# 5. A grouped summary: mpg by gearbox
aggregate(mpg ~ am, data = mtcars, FUN = mean)