Many data sets are deliberately set up such that missing values have a special code, e.g. '99' so that these are easily identifiable by humans.

Name: Many data sets are deliberately set up such that missing values have a special code, e.g. '99' so that these are easily identifiable by humans.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

This is true. Many data sets use a special code to denote missing values so that they can be easily identified and handled in further analysis. Common codes include '99', '-999', and 'NaN'.

Many Data Sets Are Deliberately Set Up Such That Missing