HowToCodePage

R

A language built for statistics and data analysis.

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This course has 3 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.

Lessons

  1. Vectors, factors and data framesThe four things every R user does with a vector, and the data frame rules that decide whether your analysis is correct.
  2. Data manipulation with base RSelect, filter, arrange, mutate, group and join without leaving base R — and the exact dplyr verb each base expression replaces.
  3. Base graphics and ggplot2The painter's model behind base plots, the grammar behind ggplot2, and how to write a chart to a file without losing it.

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Last refreshed 2026-09-17.