29.18 Making tidy data with broom

The broom package provides three general tools for turning models into tidy data frames:

1. broom::glance(model) returns a row for each model. Each column gives a model summary: either a measure of model quality, or complexity, or a combination of the two.

2. broom::tidy(model) returns a row for each coefficient in the model. Each column gives information about the estimate or its variability.

3. broom::augment(model, data) returns a row for each row in data, adding extra values like residuals, and influence statistics.

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