Regression 4 Categorical regressors Quality parameters
Channel: Алексей Ротмистров
Date: 16/12/2017

Navigation on video fragments: http://www.rotmistrov.com/fairelen (after entering, use the navigation area on the page's right side)
Before interpreting the model, I shall examine it by 3 quality parameters: non-shifting, homoscedasticity, stability. For examing non-shifting and homoscedasticity, I need saving deleted residuals. They indicate which cases are poorly predicted by the model. The "Explore" procedure shows that the deleted residuals' mean value doesn't equal zero in population. Thus, the model systematically overestimates values of a dependent variable. Consequently, I shall add the deleted residuals' mean value to a model's constant.