https://www.youtube.com/watch?v=VDlnuO96p58
视频解释了统计学中令人困惑的自由度概念，通过几何视角展示其与随机向量维度的关系，并关联到t分布、卡方分布和样本方差计算。
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Url: https://www.youtube.com/watch?v=VDlnuO96p58
Title: Degrees of Freedom, Actually Explained - The Geometry of Statistics | Ch. 1 (#SoME4)
Uploader: Sam Levey
Uploader ID: @samlevey3263
