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کامپیوتر و شبکه::
غیرتصادفی
Missing values can be classified as either random or non-random:
Non-random missing values may occur because the key informant purposefully did not answer some questions (confusing or sensitive question, no appropriate choices such as "no opinion" or "not applicable").
, missing values that are non-random), so you have a non-representative sample after removing the cases with missing values.
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