diff --git a/education/statistics/Correlation and Regression.md b/education/statistics/Correlation and Regression.md index bdd446d..90dce8c 100644 --- a/education/statistics/Correlation and Regression.md +++ b/education/statistics/Correlation and Regression.md @@ -96,7 +96,7 @@ $$ \hat{y} = \frac{x-\bar{x}}{\sigma_x} * r * \sigma_y + \bar{y} $$ 3. Multiply that by $\sigma_y$ 4. Add the average of $y$ -- For a positive association, for every $\sigma_x$ above average we are in $x$, the line predicts $y$ to be $\sigma_y$ standard deviations above y.x +- For a positive association, for every $\sigma_x$ above average we are in $x$, the line predicts $y$ to be $\sigma_y$ standard deviations above y. - There are two separate regression lines, one for predicting $y$ from $x$, and one for predicting $x$ from $y$ - Do not extrapolate outside of the graph