Categorical columns contain distinct categories. The defining aspect of a categorical column is that there is a set number of predefined categories.
The categories may be ordered or unordered. Ordered categories are known as ordinal while unordered categories are known as nominal.
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Encode categories as numerical labels.
Encode categories as numerical labels using a pre-determined order.
Encode categories as a smooth distribution. Useful for imbalanced values.
Encode categories as a smooth distribution using a pre-determined order. Useful for imbalanced values.
Encode categories into a multi-modal distribution by using a frequency-based analysis.
Encode categories into multiple, binary columns using one hot encoding.
Encode boolean data as binary 0/1 labels.
"VISA", "AMEX" or "DISCOVER". This is nominal because the categories don't have any order.