LEVEL 03 · 80 MIN
Model Builder
Assemble the control matrix.
One signal is no longer enough. Build a multivariable model, isolate partial effects, audit its precision, and defend every control you connect.
MISSION OBJECTIVES
- Specify a multiple linear regression and interpret partial slopes.
- Explain control variables, zero conditional mean, and omitted-variable risk.
- Use OLS residual properties and partialling-out intuition.
- Distinguish ordinary from adjusted R-squared.
- Connect estimator variance to noise, unique variation, sample size, collinearity, and Gauss–Markov efficiency.