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1. Missing Completely at Random:
- No systematic relationship between a column's missing values and
other or own values.
- eg : errors when inputting data
2. Missing at Random:
- There is a systematic relationship between a
column's missing values and other observed values.
- eg : missing ozone data for high temperature
3. Missing not at Random:
- There is a systematic relationship between a
column's missing values and unobserved values.
- eg : missing temperature values for high temperature