An ensemble of decision trees built on different samples or features

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Free CFA Quantitative Methods Practice Questions & Answers

1,200 exam-style Quantitative Methods questions. Pick your answer, hit Check answer, and see the worked solution — free to start, no signup.

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Question 391

Adjusted (R^2) is used instead of (R^2) because:

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Question 392

A model that fits the historical data extremely well but performs poorly on new data is likely:

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Question 393

A predicted probability from a logistic regression of 0.8 for default means:

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Question 394

Supervised learning involves:

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Question 395

Overfitting in machine learning means:

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Question 396

A common way to check for overfitting is to:

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Question 397

Penalized regression methods (like Lasso or Ridge) are used to:

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Question 398

A decision tree model:

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Question 399

A random forest is:

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Question 400

In supervised learning, a “training set” is:

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Question 401

A “test set” is used to:

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Question 402

Cross-validation is a technique to:

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Question 403

A neural network consists of:

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Question 404

Deep learning refers to neural networks with:

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Question 405

Feature selection aims to:

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Question 406

If two independent variables are uncorrelated, this means:

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Question 407

A model with too many variables may show:

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Question 408

A model with too few variables may show:

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Question 409

A model that fits the training data extremely well but fails on new data is:

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Question 410

A key difference between supervised and unsupervised learning is:

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Question 411

A model that memorizes training data but fails on new data is:

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Question 412

A validation set is used to:

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Question 413

A test set is used to:

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Question 414

Regularization methods help reduce:

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Question 415

A decision tree may overfit because:

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Question 416

A random forest reduces overfitting by:

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Question 417

Feature engineering involves:

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Question 418

ARCH behavior implies that variance is:

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Question 419

Very common words are removed because they:

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Question 420

Very rare words are often removed because they:

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Free CFA Quantitative Methods Practice Questions & Answers

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