vault backup: 2023-12-12 14:43:22

education/statistics/Correlation and Regression.md

@@ -3,7 +3,13 @@
 # Correlation
 ## Scatter Diagrams
 A scatter diagram or scatter plot shows the relationship between two variables. One variable is on the X axis, the other on the Y axis. 
-
+### Association
+- Positive association is demonstrated when the dots are trend upward as `x` increases. 
+- Negative association is demonstrated when the the dots trend downward as `x` increases.
+- Strong association is demonstrated when dots are clustered tightly together along a line.
+- Weak association is demonstrated when dots are not clustered tightly. 
+## Correlation
+Correlation is between `-1` and `1`. Correlation near 1 means tight clustering, and correlation near 0 means loose clustering. 
 
 # Terminology
 | Term | Definition |