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The technical storage or access that is used exclusively for statistical purposes.
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The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.
Imputation in statistics denotes the method of substituting alternative values for absent data. It is termed “unit imputation” when a single data value is replaced and “item imputation” when a part of a data value is substituted. 