diff --git a/.obsidian/plugins/obsidian-git/data.json b/.obsidian/plugins/obsidian-git/data.json
index 7b1247f..4bc189e 100644
--- a/.obsidian/plugins/obsidian-git/data.json
+++ b/.obsidian/plugins/obsidian-git/data.json
@@ -2,7 +2,7 @@
   "commitMessage": "vault backup: {{date}}",
   "autoCommitMessage": "vault backup: {{date}}",
   "commitDateFormat": "YYYY-MM-DD HH:mm:ss",
-  "autoSaveInterval": 1,
+  "autoSaveInterval": 5,
   "autoPushInterval": 0,
   "autoPullInterval": 5,
   "autoPullOnBoot": false,
diff --git a/education/statistics/Correlation and Regression.md b/education/statistics/Correlation and Regression.md
index 0f14f06..b0cc824 100644
--- a/education/statistics/Correlation and Regression.md	
+++ b/education/statistics/Correlation and Regression.md	
@@ -103,9 +103,10 @@ $$ \hat{y} = \frac{x-\bar{x}}{\sigma_x} * r * \sigma_y + \bar{y} $$
 - In a test-retest situation, people with low scores tend to improve, and people with high scores tend to do worse. This means that individuals score closer to the average as they retest. 
 - The regression *fallacy* is contributing this to something other than chance error.
 ### R.M.S Error for Regression
-The distance of an individual point from the regression line. 
+The distance of an individual point from the regression line. This only applies for a football shaped scatter diagram.
 - If a point is below the line, the error is negative.
 - If a point is above the line, the error is positive.
+- "Give or take"
 - `residual = observed - predicted` for a given $x$ value 
 - The r.m.s error is the r.m.s size of the errors
 $$ \sqrt{1-r^2}(\sigma_y) $$