question_text,difficulty
What is linear regression?,easy
What is the difference between simple and multiple linear regression?,easy
What is the primary cost function used in linear regression?,easy
What do the slope and intercept represent in a simple linear regression model?,easy
What is the R-squared metric and what does it tell you?,easy
What are the four core assumptions of linear regression?,medium
How do you handle categorical variables when building a linear model?,medium
What is multicollinearity and how can you detect it?,medium
Explain the difference between R-squared and Adjusted R-squared.,medium
How does gradient descent work in the context of linear regression?,medium
What are residuals and why is residual analysis important?,medium
How do you derive the normal equation for ordinary least squares?,hard
What are the specific consequences of violating the homoscedasticity assumption?,hard
Explain the bias-variance tradeoff specifically for linear regression models.,hard
How do Ridge and Lasso regularization modify standard linear regression?,hard
How would you implement linear regression from scratch without using external libraries?,hard
What happens to your regression model when the number of features exceeds the number of observations?,hard