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Within these cross-tabulated tables, ^vo types of suppression are in operation. The first type is termed " Primary Suppression " and affects only the data category for the tract(s) being summarized. An example of this type of suppression would be if fewer than 30 persons of a specific racial or ethnic group lived within the tract, the data for these people would be omitted — but only for the data category of that tract. The second type of suppression which occurs on these printouts is termed " ...Complennentary " suppression. Very simply, complementary suppression occurs when data on small numbers of persons of specific racial or ethnic groups can be derived using subtraction, if all data for other racial groups is presented. In order to prevent these people from being identified, the Bureau of the Census suppresses data not only for that specific racial/ethnic group, but also for all other racial/ethnic groups, or the next racial group having a small population within the area. An example would be if five Blacks lived in a tract and all other persons in that tract were White, all data categories would be suppressed as well as all categories for Whites.
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