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For certain group quarters (GQ) characteristics and GQ types, the item nonresponse rates do not meet the Census Bureau's quality standards. Missing data for a particular question is called item nonresponse. It will occur when a respondent fails to provide an answer to a question or when an invalid answer is provided. The Census Bureau uses allocation methods to correct for item nonresponse and thus, allocation rates are used to measure the magnitude of item nonresponse. The Census Bureau has established a standard that states users should be made aware of key data items with allocation rates exceeding 20 percent. Several GQ population characteristics in the subject tables did not meet this standard. For example, item allocation rates for characteristics such as year of entry and income were high for certain GQ types and for the GQ population as a whole. A separate document with the item allocation rates for GQ characteristics that did not meet the Census Bureau's quality standard is provided below. High item allocation rates can adversely impact final estimates for the GQ population and introduce bias if the characteristics of nonrespondents differ from those of respondents. If the GQ population makes up a large proportion of the total population for an area, the estimates for the total population can likewise be affected.
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