Chess ELO Expected Score Calculator Formula source: Solon, Nate. "How Elo Ratings Actually Work." Zwischenzug, https://zwischenzug.substack.com/p/how-elo-ratings-actually-work Expected Score = 1 / (1 + 10^((opponent_rating - player_rating)/400))

Flight Performance Analysis: Alaska Airlines vs AmWest Airlines This comprehensive analysis examines flight delay performance for Alaska Airlines and AmWest Airlines across five major West Coast destinations (Los Angeles, Phoenix, San Diego, San Francisco, and Seattle) using data transformation, statistical analysis, and visualization techniques in R. The study demonstrates how overall network performance metrics can mask significant city-by-city operational variations, revealing that while AmWest achieves superior overall performance with a 10.9% delay rate compared to Alaska's 13.3%, the "better" airline varies substantially by destination. Through data tidying with tidyr, statistical summaries with dplyr, and professional visualizations using ggplot2, the analysis illustrates the critical importance of route-specific performance evaluation for both passengers making travel decisions and airlines optimizing operational strategies. Key findings show that both airlines maintain excellent performance with delay rates below 15%, but city-by-city analysis reveals location-specific operational competencies that are obscured when relying solely on aggregate network statistics, highlighting the analytical value of granular data examination in transportation performance assessment.

Series de tiempo Jhojan Raul Zambrano Gomez Ciencia de datos Análisis de Series Temporales utilizando R Markdown Buen día, comparto Taller del corte

Homework - R

Statistics take home exam

特徴 - 自動データ取得: TANITA Health Planet APIから体重・体脂肪率データを自動取得 - 柔軟な期間指定: 任意の日付範囲でのデータ取得が可能 - 美しい可視化: ggplot2による高品質なグラフとトレンド分析 - 包括的な解析: BMI計算、健康指標との比較、（統計的分析はまだ） - レポート生成: Quartoによる自動レポート作成