From 7f0d9ce6c432fb0b6bd462ba77bdc60dbb205cd0 Mon Sep 17 00:00:00 2001 From: zleyyij Date: Wed, 13 Dec 2023 14:18:19 -0700 Subject: [PATCH] vault backup: 2023-12-13 14:18:19 --- education/statistics/Correlation and Regression.md | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/education/statistics/Correlation and Regression.md b/education/statistics/Correlation and Regression.md index d168be7..2b4cf58 100644 --- a/education/statistics/Correlation and Regression.md +++ b/education/statistics/Correlation and Regression.md @@ -8,14 +8,15 @@ If a scatter diagram is football shaped, it can be summarized using the 5-number | Variable | Description | | -- | -- | -| $ave_x$ | 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| +| $\mu_x$ | The average of the set graphed along the X axis | +| $\sigma_x$| The standard deviation of set graphed along the X axis | +| $\mu_y$ | The average of the set graphed along the Y axis | +| $\sigma_y$ | 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 +The intersection of the averages of x and y will be the center of an oval shaped scatter diagram. Draw lines $2\sigma$ (will contain ~95% of all data) from the center along each axis to generalize the shape of a scatter plot. +You can appr ### Association - Positive association is demonstrated when the dots are trend upward as $x$ increases ($r$ is positive). - Negative association is demonstrated when the the dots trend downward as $x$ increases ($r$ is negative).