Title: "Unit 4 Case Study: Who's Friends with Who in Middle School" Course: ECI 586 Intro to Learning Analytics Author/Professor: Dr. Joey Huang Student: Katherine Jiang

This publication applies the Elo expected-score formula to a chess tournament dataset. By estimating each player’s predicted score from their rating and average opponent strength, I calculate expected performance for all seven rounds. I then compare these expectations to actual results, identify overperformers and underperformers, and demonstrate how Elo metrics can be used to evaluate tournament performance.

In this assignment, I tidied a flight delay dataset, reshaped it into long format, and compared on-time vs delayed flights. The analysis showed how overall results differed from city-level patterns.