Kamus Demografi Pelbagai Bahasa, Edisi Kedua, Volum Bahasa Malaysia

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The accuracy¹ of population statistics will depend among other factors on the completeness² of the count of individuals, groups or events on which they are based. Omissions³ and undercount³ tend to generate underestimation⁴ while multiple counting⁵ leads to over-estimation⁶. Additional sources of error include misreporting⁷ of a characteristic such as age and classification errors⁸. Such inaccuracies are sometimes detected by post-enumeration tests⁹ or quality checks¹⁰. Occasionally certain questions are not answered or insufficiently answered and this may lead to considerable inaccuracy, the incidence of which is indicated by the frequency of the class designated as nonresponse¹¹, not stated¹¹ or unknown¹¹.