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Knowledge check

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Answer the following questions to check your learning.

1.

You are using scikit-learn to train a regression model from a dataset of sales data. You want to be able to evaluate the model to ensure it predicts accurately with new data. What should you do?

Use all of the data to train the model. Then use all of the data to evaluate it

Train the model using only the feature columns, and then evaluate it using only the label column

Split the data randomly into two subsets. Use one subset to train the model, and the other to evaluate it

2.

You have created a model object using the scikit-learn LinearRegression class. What should you do to train the model?

Call the predict() method of the model object, specifying the training feature and label arrays

Call the fit() method of the model object, specifying the training feature and label arrays

Call the score() method of the model object, specifying the training feature and test feature arrays

3.

You train a regression model using scikit-learn. When you evaluate it with test data, you determine that the model achieves an R-squared metric of 0.95. What does this metric tell you about the model?

The model explains most of the variance between predicted and actual values.

The model is 95% accurate

On average, predictions are 0.95 higher than actual values

You must answer all questions before checking your work.

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