Using a global constant to fill in the missing value: Replace all missing attribute values by
the same constant, such as a label like Unknown," or ¡1. If missing values are replaced by, say,
Unknown," then the mining program may mistakenly think that they form an interesting concept,
since they all have a value in common | that of Unknown." Hence, although this method is simple,
it is not recommended.
Using a global constant to fill in the missing value: Replace all missing attribute values bythe same constant, such as a label like Unknown," or ¡1. If missing values are replaced by, say,Unknown," then the mining program may mistakenly think that they form an interesting concept,since they all have a value in common | that of Unknown." Hence, although this method is simple,it is not recommended.
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