Question: You are assigned to read a study that finds data transformation can help customer churn prediction. Identify data transformation ( s ) used in that

You are assigned to read a study that finds data transformation can help customer churn prediction. Identify data transformation(s)used in that study.
Discretization of continuousnumerical attribute
Dimension reduction
Aggregation to lower granularity and reduce data size
Sampling to reduce number of records

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