Mean or median imputation consists of replacing missing values with the variable mean or median. This can only be performed in numerical variables. The mean or the median is calculated using a train set, and these values are used to impute missing data in train and test sets, as well as in future data we intend to score with the machine learning model. Therefore, we need to store these mean and median values. Scikit-learn and Feature-engine transformers learn the parameters from the train set and store these parameters for future use. So, in this recipe, we will learn how to perform mean or median imputation using the scikit-learn and Feature-engine libraries and pandas for comparison.
Use mean imputation if variables are normally distributed and median imputation otherwise. Mean and median imputation may distort the distribution of the...
