From b6fbe1fd3aa39b6f3f75b6628278a4d1379363bc Mon Sep 17 00:00:00 2001 From: zleyyij Date: Wed, 20 Dec 2023 14:07:33 -0700 Subject: [PATCH] vault backup: 2023-12-20 14:07:33 --- .obsidian/plugins/obsidian-git/data.json | 2 +- education/statistics/Correlation and Regression.md | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) 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 $$ \sqrt{1-r^2}(\sigma_y) $$