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Basic Question 9 of 11
Each time we add regression variables to the model, the amount of explained variation will decrease. Is this true?
User Contributed Comments 6
| User | Comment |
|---|---|
| GileOne | pls can anybody explain this? |
| katybo | If you add a new independent variable, the unexplained variation decreases, and R2 increases. R2 = 1- SSE/Total SS |
| epiziL2 | Adding a new variable will reduce the quantity of error from the model as you creat an additional explanation to the overall model. Hence SSE reduces(ie only when the new variable is corelated to the independent variable and is not linearly related to the previous independent.(In that case the new effects the new variable comes in with has not yet been captured by the model).Hence SST=SSR+SSEreduces |
| mishis | epizL2: you meant to say SSE reduces only when new variables correlated to dependent variable.... |
| daverco | This is an unsatisfactory explanation. If adding an independent variable helps explain any of the unexplained variation (meaning, it is a "useful" variable to the model), wouldn't that increase R-squared? If it is even slightly correlated with the dependent variable, wouldn't that add explanatory power to the regression, and therefore increase R-squared? |
| davidt876 | yea daverco, i think the wording in the answer is mixed up and they're trying to say what u said |
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Edward Liu
Learning Outcome Statements
evaluate how well a multiple regression model explains the dependent variable by analyzing ANOVA table results and measures of goodness of fit;
CFA® 2025 Level II Curriculum, Volume 1, Module 2.