### GIGAMIND

Folder:

113 Math

File:

113.033 Statistics - Residuals

# Residuals

Residual is the y-axis distance between where a point actually is and where the linear regression line crosses the y-axis for that x-value.

- E.g. if the point was (3,8) and the linear regression line crosses at the point (3,10) then the Residual == -2

- Residuals help us measure the line of best fit through a scatterplot

- $$r_i = y_i - \hat{y}$$

- Reads: The residual of a point `i`

equals the actual y value at point `i`

, minus the predicted regression line value at point `i`

##### Tags:

- statistics