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12
education/statistics/Correlation and Regression.md
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@ -8,13 +8,13 @@ If a scatter diagram is football shaped, it can be summarized using the 5-number
| Variable | Description |
| -- | -- |
| $ave_x$ | |
| $SD_x$| |
| $ave_y$ |
| $SD_y$ | |
| $r$ | |
| $ave_x$ | The average of the set graphed along the X axis |
| $SD_x$| The standard deviation of set graphed along the X axis |
| $ave_y$ | The average of the set graphed along the Y axis |
| $SD_y$ | The standard deviation of the set graphed along the Y axis |
| $r$ | The correlation coefficient, or how closely clustered the datapoints are in a line|
The intersection of the averages of x and y will be the center of an oval shaped scatter diagram. Draw lines 2SDs from the center along each axis to generalize the shape of a scatter plot
### Association
- Positive association is demonstrated when the dots are trend upward as $x$ increases ($r$ is positive).