Practice

Practice with data.

Real datasets from the sessions, each with three questions that get harder and the session that teaches the method. Download the file, work the questions, then watch how the instructor did it.

Baseball · 19 rows Hot-start hitters Nineteen hitters after their first 45 at-bats of a season, with the rest of their season held out, so every answer you give can be checked against what actually happened. batting_2026.csv · three questions Baseball · 500 rows Batted balls Five hundred well-elevated batted balls from a Statcast sample: exit velocity, launch angle and how far the ball went. batted_balls_2026.csv · three questions Baseball · 6,000 rows Pitch speeds by type Six thousand pitches from a Statcast sample, each with its pitch type and release speed, for the full model-checking loop. pitches_2026.csv · three questions

Three to start. The skills library has the reusable code; this is where you use it.

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