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Preprocess

Feature engineering time! You need to build a recipe to take care of non-informative but possibly valuable variables such as observation ID or deal with missing values. This is also an opportunity to transform some predictors. Say, normalize numerical features and create dummy variables for categorical ones.

The attrition dataset and the train and test splits you created in the previous exercise are available in your environment.

Den här övningen är en del av kursen

Feature Engineering in R

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Övningsinstruktioner

  • Normalize all numeric features.
  • Impute missing values using the knn imputation algorithm.
  • Create dummy variables for all nominal predictors.

Interaktiv övning med praktiskt arbete

Testa den här övningen genom att slutföra den här exempelkoden.

recipe <- recipe(Attrition ~ ., data = train) %>%
  update_role(...1, new_role = "ID") %>%

# Normalize all numeric features
  ___(all_numeric_predictors()) %>% 

# Impute missing values using the knn imputation algorithm
  ___(all_predictors()) %>%

# Create dummy variables for all nominal predictors
  ___(all_nominal_predictors())
 
recipe
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