diff --git a/education/statistics/Correlation and Regression.md b/education/statistics/Correlation and Regression.md index ac1aec5..d168be7 100644 --- a/education/statistics/Correlation and Regression.md +++ b/education/statistics/Correlation and Regression.md @@ -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).