Correlation Explained in 6 Minutes

Correlation explained: what the correlation coefficient measures, how the formula is calculated, and why correlation is not causation. This statistics lesson walks through a scatterplot, positive and negative correlation, and the Pearson correlation coefficient formula that turns paired data into r. It also separates correlation and dependence, because a weak correlation only means there is little straight-line relationship. The closing section covers correlation vs causation, and why a strong correlation coefficient still cannot tell you why two variables move together. A short math tutorial for statistics and data science.

Chapters
0:00 What Is Correlation?
0:29 Daily Returns and Scatterplots
1:38 Understanding the Correlation Coefficient
2:26 Calculating Correlation with Z-Scores
4:19 Why Curved Relationships Can Have Zero Correlation
4:43 How Unusual Days Affect Correlation
5:16 Correlation Does Not Imply Causation

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