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Random Rounding and Percentage Distributions
To ensure the confidentiality of responses collected for the 2001 Census, a random rounding process is used to alter the values reported in individual cells. As a result, when these data are summed or grouped, the total value may not match the sum of the individual values, since the total and subtotals are independently rounded. Similarly, percentage distributions, which are calculated on rounded data, may not necessarily add up to 100%.
Data Quality, Sampling and Weighting, Confidentiality and Random Rounding
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