DUNNHUMBY IT SERVICES INDIA Data Scientist Interview Questions and Answers

XGBoost is preferred over Random Forest due to its faster execution speed and better performance in complex datasets.

• XGBoost is faster than Random Forest due to its optimized implementation of gradient boosting algorithm.

• XGBoost generally performs better in complex datasets with high-dimensional features.

• XGBoost allows for more fine-tuning of hyperparameters compared to Random Forest.

• XGBoost has regularization techniqu...read more

Build a MMX Model for a given dataset and share insights

• Preprocess the data by handling missing values and encoding categorical variables

• Split the data into training and testing sets

• Build the MMX model using appropriate algorithms like decision trees or random forests

• Evaluate the model using metrics like accuracy, precision, recall, and F1 score

• Interpret the model results to gain insights and make data-driven decisions

Time series analysis can be evaluated by examining the accuracy of forecasts, the model's ability to capture trends and patterns, and the overall performance metrics.

• Evaluate forecast accuracy using metrics like Mean Absolute Error (MAE) or Root Mean Squared Error (RMSE)

• Assess the model's ability to capture trends and patterns by visualizing the data and comparing it to the model's predictions

• Analyze the overall perfor...read more

XGBoost is preferred over Random Forest due to its faster execution speed and better performance in complex datasets.

• XGBoost is faster than Random Forest due to its optimized implementation of gradient boosting algorithm.

• XGBoost generally performs better in complex datasets with high-dimensional features.

• XGBoost allows for more fine-tuning of hyperparameters compared to Random Forest.

• XGBoost has regularization techniqu...read more