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Top 48 Linear Regression Interview Questions

Entry Junior Mid Senior Expert
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Linear Regression Theoretical Questions

Q1:   

What is Linear Regression?

  Related To: Supervised Learning
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Q2:   

Explain the intuition behind Gradient Descent algorithm

  Related To: Gradient Descent
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Q3:   

Provide an intuitive explanation of the Learning Rate?

  
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Q4:   

How is the Error calculated in a Linear Regression model?

  
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Q5:   

What's the difference between Covariance and Correlation?

  Related To: Data Processing
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Q6:   

How would you detect Overfitting in Linear Models?

  Related To: Model Evaluation
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Q7:   

Define Linear Regression and its structure

  Related To: Supervised Learning
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Q8:   

What is the difference between Mean Absolute Error (MAE) vs Mean Squared Error (MSE)?

  
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Q9:   

How does a Non-Linear regression analysis differ from Linear regression analysis?

  
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Q10:   

How can you check if the Regression model fits the data well?

  
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Q11:   

What are types of Linear Regression?

  
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Q12:   

Compare Linear Regression and Decision Trees

  Related To: Decision Trees
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Q13:   

How would you fix Logistic Regression Overfitting problem?

  Related To: Cost Function, Model Evaluation
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Q14:   

How do you cope with Missing data in Regression?

  Related To: Data Processing
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Q15:   

Why can't a Linear Regression be used instead of Logistic Regression?

  Related To: Logistic Regression
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Q16:   

Why would you use Normalisation vs Standardisation for Linear Regression?

  
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Q17:   

What are some challenges faced when using a Supervised Regression Model?

  Related To: Supervised Learning
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Q18:   

What is the difference between Linear Regression and Logistic Regression?

  Related To: Logistic Regression
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Q19:   

How is Hypothesis Testing using in Linear Regression?

  
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Q20:   

In which case you would use Gradient Descent method or Ordinary Least Squares and why?

  Related To: Gradient Descent
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Q21:   

What are the Assumptions of Linear Regression?

  
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Q22:   

What's the difference between Homoskedasticity and Heteroskedasticity?

  Related To: Statistics
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Q23:   

How does it work the Backward Selection Technique?

  
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Q24:   

Explain what the Intercept Term means

  
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Q25:   

Name some Evaluation Metrics for Regression Model and when you would use one?

  Related To: Gradient Descent
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Q26:   

Name a disadvantage of R-squared and explain how would you address it?

  
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Q27:   

Explain how does the Gradient descent work in Linear Regression

  Related To: Gradient Descent
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Q28:   

What is the difference between Ordinary Least Squares and Ridge Regression?

  
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Q29:   

What are the assumptions before applying the OLS estimator?

  Related To: Data Processing
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Q30:   

What is the difference between Ordinary Least Squares and Lasso regression?

  
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Q31:   

Why use Root Mean Squared Error (RMSE) instead of Mean Absolute Error (MAE)?

  
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Q32:   

What is the difference between a Regression Model and an ANOVA Model?

  
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Q33:   

How would you decide on the importance of variables for the Multivariate Regression model?

  Related To: Feature Engineering
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Q34:   

How would you deal with Overfitting in Linear Regression models?

  Related To: Model Evaluation
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Q35:   

How would you detect Collinearity and what is Multicollinearity?

  
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Q36:   

Explain the Stepwise Regression technique

  Related To: Feature Engineering
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Q37:   

How would you implement Linear Regression Function in SQL?

  Related To: SQL
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Q38:   

Explain what is an Unrepresentative Dataset and how would you diagnose it?

  Related To: Data Processing
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Q39:   

How would you detect Heteroskedasticity?

  Related To: Data Processing
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Q40:   

How would you address the problem of Heteroskedasticity caused for a Measurement error?

  Related To: Data Processing
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Q41:   

How would you check if a Linear Model follows all Regression assumptions?

  
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Q42:   

How would you deal with Outliers in your dataset?

  Related To: Anomaly Detection, Data Processing
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Q43:   

Name some advantages of using Gradient descent vs Ordinary Least Squares for Linear Regression

  Related To: Gradient Descent
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Q44:   

How would you compare models using the Akaike Information Criterion?

  
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Q45:   

Provide an intuitive explanation of RANSAC Regression algorithm

  
 Add to PDF   Expert 
Q46:   

What types of Robust Regression Algorithms do you know?

  Related To: Anomaly Detection
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Linear Regression Practical Challenges

Q1:   

How would you train Linear Regression model using Gradient Descent? Implement in Python

 PY Related To: Gradient Descent, Python
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Q2:   

How would you train Linear Regression model using Normal Equation? Implement in Python

 PY Related To: Python
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