Residual Plot Plot Is Used to Check Which Assumption S
As you are plotting the graph between the theoretical quantiles and observed residuals. The Cooks distance statistic for every observation. A Basic Guide To Testing The Assumptions Of Linear Regression In R This plot is used to check the assumption of equal variance also called homoscedasticity among the residuals in our regression model. . If the residuals are spread equally around a horizontal line without distinct patterns red line is approximately horizontal at zero that is a good indication of having a linear relationship. If they are quite similar you can expect the QQ plot to be more linear. The vertical spread of the residuals seems less than the vertical spread of the centered fit so the model is fineIn other words after accounting for the predictors in the model relatively little residual variation remains. To validate your regression models you must use residual plots to visually confirm the validity of your mod...